Answer:
W = 1/2 K x^2 work in stretching spring x meters
W2 / W1 = 10^2 / 5^2 1/2 and K's cancel
W2 = 4 W1
W2 = 100 N
It takes a force of 25 n to stretch a spring 5 m beyond its natural length. " the work done in stretching the spring 10 m from its natural length is 250 Joules."
To calculate the work done in stretching the spring, we will use Hooke's Law and the work-energy principle. Hooke's Law states that the force needed to stretch or compress a spring is proportional to the displacement from its natural length:
F = k * x
where F is the force, k is the spring constant, and x is the displacement from the natural length. We are given that it takes a force of 25 N to stretch the spring 5 m beyond its natural length, so:
25 N = k * 5 m
Now, solve for the spring constant k:
k = 25 N / 5 m = 5 N/m
Next, we need to calculate the work done in stretching the spring 10 m from its natural length. The work-energy principle states that the work done on an object is equal to the change in its potential energy:
W = (1/2) * k * x^2
where W is the work done, k is the spring constant, and x is the displacement from the natural length. We found the spring constant k to be 5 N/m, and we are given that the displacement x is 10 m, so:
W = (1/2) * 5 N/m * (10 m)^2
Now, calculate the work done:
W = (1/2) * 5 N/m * 100 m^2 = 250 J
Therefore, the work done in stretching the spring 10 m from its natural length is 250 Joules.
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how fast will the ball passes its equilibrium position each time? assume that friction may be neglected
If we know the mass of the ball, the spring constant, and the maximum displacement (or amplitude) of the ball from its equilibrium position, we can calculate the speed at which the ball passes through its equilibrium position each time.
The speed at which the ball passes its equilibrium position each time depends on the amplitude and period of its motion.
Assuming the ball is executing simple harmonic motion, the time period (T) of the motion can be calculated using the formula:
T = 2π√(m/k)
where m is the mass of the ball and k is the spring constant.
Once we know the time period of the motion, we can calculate the speed at which the ball passes through its equilibrium position using the formula:
v = A/T
where A is the amplitude of the motion.
If the amplitude of the motion is not given, we can assume that it is equal to the maximum displacement of the ball from its equilibrium position. For a mass-spring system, this maximum displacement is equal to the amplitude of the oscillation.
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Determine the resistance of a aluminum wire, if the resistance of the cone obtained after cutting it into ten equal parts and stacking them is found to be 1 ohm
Answer:
The resistance of the original aluminum wire is 1/100 ohm.
Explanation:
A wire's resistance is proportional to its length and inversely proportional to its cross-sectional area. When a wire is cut into ten equal segments and stacked, its length is decreased by one-tenth yet its cross-sectional area stays constant.
Let R denote the original aluminium wire's resistance.
When the wire is cut into ten equal sections and stacked, the resistance of each component is ten times that of the original wire (since the length is one-tenth and the cross-sectional area stays constant). As a result, the resistance of one portion is 10R.
The resistance of the whole cone is 1 ohm when all 10 pieces are stacked. As a result, one portion has a resistance of 1/10 ohm.
Equating the resistance of one part to 10R, we get:
10R = 1/10 ohm
Solving for R, we get:
R = 1/100 ohm
Therefore, the resistance of the original aluminum wire is 1/100 ohm.
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consider two stars, one at a distance of 10,000 light years from the galactic center and one at a distance of 26,000 light years from the galactic center. which stars has a higher rotational velocity?
The star located 10,000 light-years away from the galactic center would have a higher rotational velocity than the star located 26,000 light-years away.
The galaxy's rotational speed is not constant across its radius. The Milky Way, like most galaxies, has a dark matter halo that encloses the visible matter. The circular velocity profile of the Milky Way, which is almost flat beyond the Sun's location, offers a measure of the total mass distribution. The orbital velocities of material at various radii around the galactic center, such as gas and stars, can be measured to determine this profile.
Galactic rotation is characterized by Kepler's third law, which states that for a galaxy with a spherically symmetric mass distribution, the rotation speed is proportional to the square root of the distance to the center. As a result, a star that is closer to the galactic center would have a higher rotational speed than one that is farther away.
Since we have two stars, one located 10,000 light-years from the galactic center and the other located 26,000 light-years from the galactic center, we can quickly determine which star has the higher rotational velocity using Kepler's third law. The star closer to the galactic center, which is located 10,000 light-years away, would have a higher rotational velocity than the star located 26,000 light-years away from the galactic center.
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Why is an ammeter always connected in series and a voltmeter always in parallel in a circuit?
An ammeter always connected in series and a voltmeter always in parallel in a circuit.
An ammeter is always connected in series because it is used to measure the current flowing through a particular part of a circuit. When an ammeter is connected in series, all of the current flowing through the circuit also flows through the ammeter. By measuring this current, the ammeter can provide an accurate reading of the current in that part of the circuit. If an ammeter were connected in parallel, it would change the resistance of the circuit and interfere with the current flow, giving an inaccurate reading.
A voltmeter is always connected in parallel because it is used to measure the voltage difference between two points in a circuit. When a voltmeter is connected in parallel, it is connected across the two points where the voltage difference is to be measured. This means that the voltmeter has a very high resistance, which ensures that it draws very little current from the circuit and does not affect the voltage being measured. If a voltmeter were connected in series, it would change the resistance of the circuit and interfere with the voltage being measured, giving an inaccurate reading.
Hence, an ammeter always connected in series and a voltmeter always in parallel in a circuit.
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the magnitude of the total work done during the cycle is 1900 j and the change in internal energy from 1 ! 2 ! 3 is 1500.3 j. a) determine the heat, the work done on the gas, and u for a complete cycle. make sure to have the correct signs. b) how many active modes does each gas particle have? c) what is the heat for subprocess 3 ! 1?
a) Heat = 1900 J, Work done on the gas = 399.7 J, ΔU = 1500.3 Jb) Each monatomic gas particle has 3 active modes. c) Heat for subprocess 3 to 1 = -399.7 J
a) The heat and work done on the gas during a cycle Internal energy is a state function, which implies that the changes in the internal energy of a system are independent of how the energy is transferred. The net heat added to a system is equal to the difference between the work done by the system and the change in the internal energy of the system. Thus, the formula for the first law of thermodynamics is as follows: Q - W = ΔUwhere Q is the heat, W is the work done on the gas, and ΔU is the change in internal energy. Substituting the values given, we have1900 - W = 1500.3Therefore, W = 399.7 J Heat can be calculated as follows: Q = ΔU + W = 1500.3 + 399.7 = 1900 Jb) Number of active modes in each gas particleEach gas particle has three degrees of freedom: translational, rotational, and vibrational. For a monatomic gas, the gas particles only have translational degrees of freedom since they cannot rotate or vibrate. Thus, each monatomic gas particle has three active modes. c) Heat for subprocess 3 to 1The heat for subprocess 3 to 1 can be calculated using the first law of thermodynamics: Q = ΔU + W For this subprocess, ΔU = 1500.3 J and W = -1900 J (since the gas is expanding and doing work on the surroundings).Thus,Q = 1500.3 - 1900 = -399.7 J
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green light of wavelength 540 nm is incident on two slits that are separated by 0.50 mm. (a) make a list of physical quantities you can determine using this information and determine three of them. (b) describe three changes in the experiment that will each result in doubling the distance between the 0th and the first bright spot on the screen. explain.
Green light of wavelength 540 nm is incident on two slits that are separated by 0.50 mm can be determined various steps.
How can we describe Green light of wavelength?(a) Physical quantities that can be determined using this information include:
Wavelength of the light (given as 540 nm)Distance between the slits (given as 0.50 mm)Distance from the slits to the screen (not given, but assumed to be known)Three physical quantities that can be determined using this information are:
The spacing between bright fringes on the screenThe angle of diffraction of the lightThe location of the central bright fringe on the screen(b)
Three changes that will each result in doubling the distance between the 0th and the first bright spot on the screen are:
Doubling the distance between the slits and the screen: The distance between the slits and the screen affects the spacing between bright fringes on the screen.
By doubling the distance between the slits and the screen, the spacing between bright fringes will be doubled.
Halving the distance between the slits: The distance between the slits affects the angle of diffraction of the light.
By halving the distance between the slits, the angle of diffraction will be doubled, resulting in the doubling of the distance between the 0th and the first bright spot on the screen.
Using light of half the wavelength: The wavelength of the light affects the spacing between bright fringes on the screen.
By using light of half the wavelength (i.e., 270 nm), the spacing between bright fringes will be halved, resulting in the doubling of the distance between the 0th and the first bright spot on the screen.
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pls help me with this question I need it by Monday thanks Q1 and 2
1) current
2) in series
3) voltage
4) In parallel
How are ammeters and voltmeters connected?Ammeters are connected in series with the component or part of the circuit being measured, so that the entire current flows through the ammeter. This means that the ammeter must have a very low resistance, so that it does not significantly alter the current being measured. Typically, ammeters have a built-in shunt resistor to achieve this low resistance.
On the other hand, voltmeters are connected in parallel with the component or part of the circuit being measured, so that they measure the voltage across the component or part. This means that the voltmeter must have a very high resistance, so that it does not draw significant current from the circuit and alter the voltage being measured. Typically, voltmeters have a built-in series resistor to achieve this high resistance.
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which things are audible? select all that apply. responses clouds forming clouds forming birds singing in the trees birds singing in the trees lightning streaking across the sky lightning streaking across the sky wind howling
Audible things: birds singing, wind howling. Clouds forming and lightning are not audible because they don't produce sound waves.
Of the choices given, two things are discernible: birds singing in the trees and wind yelling.
Mists framing and lightning streaking across the sky are not perceptible on the grounds that they don't deliver sound waves. Mists framing are a visual peculiarity brought about by changes in temperature and dampness in the air, and lightning produces electromagnetic waves however not sound waves.
Birds singing in the trees and wind crying are both perceptible in light of the fact that they produce sound waves. Birds produce sound by vibrating their vocal ropes, and the subsequent sound waves can head out through the air to be heard by people. Wind can make objects vibrate, delivering sound waves that can likewise be heard by people.
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when measuring your angles of incidence and angles of refraction, how should you always make sure to measure them?
When measuring angles of incidence and angles of refraction, always make sure to measure them from the normal line, which is perpendicular to the surface at the point of contact. This ensures accurate measurements and proper calculations in refraction scenarios.
When measuring angles of incidence and angles of refraction, it is essential to ensure that you always measure them using the correct tools or instruments.What is an angle?An angle is a measure of rotation, expressed in degrees, that two lines or sides create around a common point called the vertex. Two rays or lines originate from a single point and diverge in different directions to form an angle.Measuring anglesTo measure angles, you'll need a protractor, a device that's specifically built for this task. Place the protractor on the angle's vertex so that the base lines of the protractor are parallel to the lines or sides of the angle you're measuring.Angle of incidenceThe angle of incidence is the angle between the incident ray and the normal line to a surface, such as the surface of an optical lens, mirror, or prism. The angle of incidence is denoted by the Greek letter “θ” (theta).Angle of refractionThe angle of refraction is the angle between the refracted ray and the normal line to a surface, such as the surface of an optical lens, mirror, or prism. The angle of refraction is denoted by the Greek letter “θ” (theta).Therefore, when measuring angles of incidence and angles of refraction, it is essential to ensure that you always measure them using the correct tools or instruments. The angle measurement process is done using a protractor.
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If the roller coaster weighs 10,000kg and is traveling at 85 meters per second (m/s) what is the kinetic energy? Kinetic energy is measured in joules (j)?
Answer:
36,125KiloJoules.
Explanation:
K.E= 1/2MV².
that's 0.5 X 10,000 X 85.
which equals 36, 125, 000 Joules or 36,125 Kilo Joules.
Answer:
36,125,000 Joule is the answer according to the formula KE=1/2×m×(v)2
a 90-kg (including any equipment) skydiver drops out of a plane. using an air density of 1.0 kg/m3, a frontal surface area of 1.0 m2, and a drag coefficient of 0.8, what will the skydiver's terminal velocity be?
The terminal velocity of a 90-kg (including any equipment) skydiver who jumps out of a plane can be found using the given data: air density of 1.0 kg/m3, a frontal surface area of 1.0 m2, and a drag coefficient of 0.8.What is terminal velocity.
Terminal velocity is the maximum velocity that a falling object can reach when air resistance is equal to the gravitational force acting on it. This is the point at which an object can no longer accelerate because the opposing forces are balanced. Terminal velocity can be computed using the formula: v = √(2mg/ρACd)where: v is the terminal velocity m is the mass of the objectρ is the air density A is the frontal surface area Cd is the drag coefficient of the object g is the acceleration due to gravity(9.81 m/s²)Substituting the provided values: v = √(2(90 kg)(9.81 m/s²)/(1.0 kg/m³)(1.0 m²)(0.8)) = 72.22 m/s Therefore, the skydiver's terminal velocity is 72.22 m/s.
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a child pushes a merry-go-round from rest to a final angular speed of 0.50 rev/s with constant angular acceleration. in doing so, the child pushes the merry go-round 2.0 revolutions. what is the angular acceleration of the merry-go-round?
The angular acceleration of the merry-go-round is 4 rad/s².
To find the angular acceleration of the merry-go-round, follow these steps:
1. Convert the final angular speed from rev/s to rad/s:
Final angular speed = 0.50 rev/s * 2π rad/rev = π rad/s
2. Convert the number of revolutions to radians:
Number of revolutions = 2.0 rev * 2π rad/rev = 4π rad
3. Use the angular displacement equation to find the angular acceleration:
θ = ω₀ * t + 0.5 * α * t^2, where θ is angular displacement, ω₀ is initial angular speed (0 in this case), α is angular acceleration, and t is time.
4. Use the final angular speed equation to find time:
ω = ω₀ + α * t, where ω is final angular speed, ω₀ is initial angular speed (0 in this case), α is angular acceleration, and t is time.
5. Rearrange the final angular speed equation to find time in terms of angular acceleration:
t = (ω - ω₀) / α = π / α
6. Substitute the time expression into the angular displacement equation:
4π = 0.5 * α * (π / α)^2
7. Solve for angular acceleration:
α = 4 rad/s²
Hence, the angular acceleration of the merry-go-round is 4 rad/s².
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a 0.686 meter long wire has a cross sectional area of 8.23 * 10 ( to power -6 ) meter² and a resistance of 0.125 at 20°C this wire could be made of:
1) aluminium
2) copper
3) tungsten
4) nichrome
Answer: 4) nichrome
Explanation:
I did the math
The wire could be made of copper. Therefore, option 2 is correct.
Use the formula for resistance:
R = (ρ × L) / A
where:
R is the resistance of the wire,
ρ is the resistivity of the material,
L is the length of the wire, and
A is the cross-sectional area of the wire.
Calculate the resistivity for each material using the given information and then compare it with the given resistance value.
Aluminum:
Resistance of the wire (R) = 0.125 Ω
Length of the wire (L) = 0.686 m
The cross-sectional area of the wire (A) = 8.23 × [tex]10^{-6}[/tex] m²
R = (ρ × L) / A
ρ = (R A) / L
= (0.125 × 8.23 × 10⁻⁶) / 0.686
Calculating ρ for aluminum:
ρ = 1.5 × 10⁻⁸ Ω.m
Copper:
ρ = 1.7 × 10⁻⁸Ω.m
Tungsten:
ρ = 5.6 × 10⁻⁸ Ω.m
Nichrome:
ρ = 1.10× 10⁻⁶ Ω.m
Compare the resistivity values with the known resistivity values for different materials:
Aluminum: ρ = 1.5 × 10⁻⁸ Ω.m
Copper: ρ = 1.7 × 10⁻⁸ Ω.m
Tungsten: ρ = 5.6 × 10⁻⁸ Ω.m
Nichrome: ρ = 1.10 × 10⁻⁶ Ω.m
Therefore, the wire could be made of copper.
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You are driving your 1700 kg car at 18 m/s down a hill with a 5.0∘ slope when a deer suddenly jumps out onto the roadway. You slam on your brakes, skidding to a stop.
How far do you skid before stopping if the kinetic friction force between your tires and the road is 1.5×10^4 N?Solve this problem using conservation of energy.
Express your answer to two significant figures and include the appropriate units.
The distance the car skids before coming to a stop when driving down a hill with a slope of 5.0° at 18 m/s using conservation of energy is 19.84 meters.
What is conservation of energy?Conservation of energy is the principle that the total energy of an isolated system cannot change. The energy can only be transformed from one form to another. The law of conservation of energy, also known as the first law of thermodynamics.
To determine how far you skid before stopping using conservation of energy, follow these steps:
Step 1: Calculate the initial kinetic energy of the car: [tex]KE_{initial} = (1/2) * 1700 kg * (18 m/s)^2 = 275400 J[/tex]
Step 2: Calculate the gravitational potential energy gained by the car [tex](PE_{gravity})[/tex]: firstly, to find h we need to express it in terms of the distance. h = distance * sin(angle)
So, [tex]PE_{gravity} = 1700 kg * 9.81 m/s^2 * distance * sin(5.0^\circ)[/tex]
Step 3: Calculate the work done by friction [tex](W_{friction})[/tex]: [tex]W_{friction} = 1.5 * 10^4 N * distance[/tex]
Step 4: Apply conservation of energy: [tex]KE_{initial} + PE_{gravity} = W_{friction}[/tex], we get:
[tex]275400 J + (1700 kg * 9.81 m/s^2 * distance * sin(5.0^\circ)) = 1.5 * 10^4 N * distance[/tex]
Step 5: Solve for distance
[tex]distance * (1.5 * 10^4 N - 1700 kg * 9.81 m/s^2 * sin(5.0^\circ)) = 275400 J[/tex]
[tex]distance = 275400 J / (1.5 * 10^4 N - 1700 kg * 9.81 m/s^2 * sin(5.0^\circ))[/tex]
Using a calculator, the distance is approximately 19.84 meters. So, you skid about 19.84 meters before stopping.
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how can sounds be changed and what is the cause of the change?
Sounds can be changed in a variety of ways depending on the source of the sound and the type of change you want to make. Here are a few examples:
PitchVolumeTimbreDurationWhat are the cause of the change in sound?The cause of the change depends on the type of change being made. For example, changing the pitch of a sound is caused by altering the frequency of the sound wave, while changing the volume is caused by altering the amplitude of the sound wave.
In general, changes to sound waves can be caused by physical manipulation of the sound source, such as adjusting the properties of a musical instrument, or by electronic processing of the sound signal using digital signal processing techniques.
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an ant of mass 1 gram clings to the rim of a flywheel of radius 0.4 m. the flywheel rotates clockwise on a horizontal shaft s at a constant rate of 2 revolutions per second. as the wheel rotates, the ant revolves past the stationary points i, ii, iii, and iv. the ant can adhere to the wheel with a force much greater than its own weight. what force must the ant hold on to stay on the wheel at point iii?
If the flywheel's rotational velocity is constant and the force applied by the ant is strong enough, the ant will adhere to the wheel's rim without slipping.
In this case, the ant's tangential velocity will be the same as the wheel's tangential velocity, and the centripetal force acting on the ant will be supplied by the frictional force.Using F = ma, we know that a = v^2/r. We can then substitute the value for the angular velocity and wheel radius to get the centripetal acceleration.
The centripetal force on the ant is m*ac. This centripetal force is supplied by the ant's grip on the wheel. Since the ant can hold on to the wheel with a force much greater than its own weight, it is safe to assume that the force of the grip is greater than the centripetal force.
In conclusion, the force with which the ant must hold on to stay on the wheel at point III is equal to the centripetal force exerted on it, which is equal to its mass multiplied by its centripetal acceleration, which is equal to m*v^2/r.
The mass of the ant is given as 1 gram (0.001 kg), and the radius of the wheel is given as 0.4 m. The linear velocity v can be calculated using the formula v = ωr. Therefore, the force required to keep the ant on the wheel at point III is:F = m*v^2/rF = 0.001*[(2*2*3.14*0.4)^2]/0.4F = 9.92 N (approximately)
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A plank is supported on flight of staircases.How
many forces are acting on the plank?
A 4
B 5
C 6
D 7
unpolarized light passes through polarizer at 60 degrees from vertical, what is the intensity of the light?
When unpolarized light passes through a polarizer at 60 degrees from the vertical, the intensity of the light is halved.
Unpolarized light, which consists of light waves vibrating in all planes perpendicular to the direction of propagation, does not have a specific direction of oscillation. This means that its electric field is randomly polarized in all directions perpendicular to the direction of motion. Polarization refers to the direction in which the electric field is oscillating.
Polarized light waves have an electric field that is oscillating in only one direction, whereas unpolarized light has an electric field that is oscillating in all directions perpendicular to the direction of motion. A polarizer is a filter that polarizes light waves by allowing only those waves that are oscillating in a particular direction to pass through. If unpolarized light passes through a polarizer at a 60-degree angle to the vertical, only half of its intensity will be able to pass through.
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A 5 kg cannonball is shot out of a cannon and has an acceleration of 8 m/s^2 at the point where it exits the cannon. What force, in N, was applied to the cannonball? (only enter the number)
The force, in N, applied to the cannonball can be calculated using Newton's Second Law of Motion, which states that the force applied to an object is equal to its mass times its acceleration:
Force = mass x acceleration
Plugging in the given values, we get:
Force = 5 kg x 8 m/s^2 = 40 N
Therefore, the force applied to the cannonball was 40 N.
which of the following statements about the terrestrial planets is false? group of answer choices earth's atmosphere plays a central role in keeping our planet from freezing cold temperatures. venus is the hottest planet in our solar system, mainly due to an elevated greenhouse effect. long ago, mars probably had a thicker atmosphere than it does now, with sufficiently high temperatures and pressures to allow liquid water to exist on its surface. earth's atmosphere allows the sun's infrared radiation in but doesn't allow much visible light to escape, resulting in the greenhouse effect. despite being the closest planet to the sun, some parts of mercury have a surface temperature far below the freezing point of water.
The statement which is false about the terrestrial planets is : "despite being the closest planet to the sun, some parts of mercury have a surface temperature far below the freezing point of water."
Mercury is the closest planet to the Sun, which means that it receives a large amount of solar radiation. However, the planet's lack of atmosphere and slow rotation result in extreme temperature variations between its day and night sides. During its daytime, temperatures can reach up to 430 °C (800 °F), which is hot enough to melt lead.
However, as Mercury rotates away from the sun and enters its nighttime, its surface cools rapidly. Due to the lack of an atmosphere to hold in heat, the planet's nighttime temperatures can drop to as low as -173 °C (-280 °F). These extreme temperature variations make it difficult for any potential life to survive on Mercury.
Despite these extreme temperature variations, some parts of Mercury do not get cold enough to freeze water. Water freezes at 0 °C (32 °F), and the lowest temperature ever recorded on Mercury was around -183 °C (-297 °F). Therefore, while some parts of Mercury can get very cold, it never gets cold enough to freeze water is the correct option.
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a shotputter can exert 68 lb of force on a 0.55-slug shot. if she directs this force at 40o to the horizontal, what is the magnitude of its horizontal acceleration?
The magnitude of the horizontal acceleration of the shot put is 1.614 [tex]ft/s^2[/tex].
To find the size of the level speed increase of the shot put, we want to utilize Newton's Subsequent Regulation, which expresses that the power applied on an article is equivalent to the item's mass times its speed increase. For this situation, the mass of the shot put is given as 0.55 slugs, and the power applied by the shot putter is 68 lb.
To decide the level part of the power, we want to utilize geometry since the power is applied at a point of 40 degrees to the flat. The level part of the power is given by Fcos(40), where F is the all out power of 68 lb. Hence, the flat part of the power is 68cos(40) = 51.96 lb.
Presently we can utilize Newton's Second Regulation to track down the size of the level speed increase. Since the power is in pounds and the mass is in slugs, we really want to change over the power into slugs. Utilizing the transformation factor 1 lb = 1/32.2 slugs, we have:
51.96 lb * (1/32.2 slugs/lb) = 1.614 slugs-[tex]ft/s^2[/tex]
In this manner, the size of the level speed increase of the shot put is 1.614[tex]ft/s^2[/tex].
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every decade, the sea ice declines by 10 percent. if there were 6 million km2 of sea ice in the year 2000, how much would remain in 2020? group of answer choices
Option b. 4.86 million km2 of sea ice would remain in 2020 if the decline rate continued at 10% per decade.
Ocean ice is a significant piece of the World's environment framework, reflecting daylight and managing the planet's temperature. Be that as it may, environmental change has caused a decrease in how much ocean ice over ongoing many years, with a typical decay pace of around 10% each 10 years. This intends that for each decade that passes, how much ocean ice remaining is 90% of the earlier ten years' sum.
To work out how much ocean ice would stay in a specific year, we can utilize the recipe: remaining ice = (1-0.1)^n * beginning ice, where n is the quantity of many years that have passed and starting ice is how much ocean ice in the beginning year. For instance, in the event that there were 6 million km2 of ocean ice in the year 2000 and 20 years (twenty years) have passed, we can compute the excess ice in 2020 as follows: remaining ice = (1-0.1)^2 * 6 million km2, which approaches around 4.86 million km2.
This computation features the huge loss of ocean ice over a generally brief timeframe, with practically 20% of the ice vanishing more than twenty years. This deficiency of ocean ice has extensive ramifications for worldwide environment examples, natural life, and human networks living in the Cold.
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The complete question is:
every decade, the sea ice declines by 10 percent. if there were 6 million km2 of sea ice in the year 2000, how much would remain in 2020? group of answer choices are a. 7.85 b.4.86 c. 6.80 d. 3.67
the devices used by mechanical cooling thermostats to turn off early enough to prevent system overshoot or temperatures below the thermostat set point are called
The devices used by mechanical cooling thermostats to turn off early enough to prevent system overshoot or temperatures below the thermostat set point are called anticipators.
An anticipator is a small resistor that operates like a little heater inside your thermostat. The anticipator is the device that controls the duration of each heating cycle in old-style thermostats. This component essentially informs the heating and cooling system to cut off early. The mechanical thermostat anticipator is made up of two parts: the thermostat switch and the heat anticipator. When the thermostat switch turns off, the anticipator's heater stays on for a short period longer, avoiding overheating or undercooling of the controlled space.
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do people weigh less near the equator because of the centrifugal force of the earth spinning? does the centrifugal force counteract gravity enough for even a marginal weight difference near the equator?
People do weigh less near the equator because of the centrifugal force of the earth spinning. Yes, The centrifugal force counteracts gravity enough for even a marginal weight difference near the equator.
This is because the equator is further away from the center of the earth than the poles.
As a result, people at the equator are moving faster than those at the poles due to the earth's rotation. This movement generates centrifugal force, which reduces the gravitational force acting on a person at the equator by about 0.3%.
Therefore, a person weighs about 0.5% less at the equator than at the poles.
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#4: A friend is wearing a pair of mirrored sunglasses whose convex surface has a focal length of (-20.0)cm. If your face is 40.0 cm from the sunglasses, how far behind the sunglasses is your image?
The image distance is negative, this means the image is formed behind the mirror, at a distance of 13.33 cm behind the sunglasses.
Since the sunglasses have a convex surface, we can use the mirror equation:
1/f = 1/do + 1/di
where f is the focal length of the mirror, do is the object distance (the distance between the object and the mirror), and di is the image distance (the distance between the mirror and the image).
In this case, f = -20.0 cm (since the mirror is convex), do = 40.0 cm (since your face is 40.0 cm from the sunglasses), and we want to find di.
Substituting these values into the mirror equation, we get:
1/(-20.0 cm) = 1/(40.0 cm) + 1/di
Simplifying this equation, we get:
-0.05 = 0.025 + 1/di
Subtracting 0.025 from both sides, we get:
-0.075 = 1/di
Dividing both sides by -0.075, we get:
di = -13.33 cm.
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what should you do if you are driving 65 mph in the far left lane of a highway and everyone else in the lane is going 70 mph and above? a. nothing. since you are at the speed limit, it is their problem to move, not yours b. move to a lane that is more appropriate to your speed c. slow down so the drivers behind you will get the hint and slow down too d. flash the lights and honk the horn so the drivers behind you will get the hint and slow down
If you are driving 65 mph in the far left lane of a highway and everyone else in the lane is going 70 mph and above, you should move to a lane that is more appropriate to your speed. The correct answer is option b.
You should switch to a lane that's more suited for your pace If you're driving 65 mph in the far left lane of a highway and everyone else is travelling 70 mph or higher,
This is because the left lane is considered the passing lane in many states, and is generally used for faster-moving traffic. Slower traffic should stay in the right-hand lane or move over if they are in the left lane.
So, option (b) move to a lane that is more appropriate to your speed is correct.
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the body position sense that orients us with respect to gravity and the immediate environment is a function of
The body position sense that orients us with respect to gravity and the immediate environment is a function of the vestibular system, which is located in the inner ear.
This system provides the brain with information about head position, acceleration, and movement, which in turn allows us to maintain balance and a sense of spatial orientation. Additionally, information from the eyes, muscles, and joints also contribute to body position sense, allowing us to integrate multiple sensory inputs and make accurate judgments about our position and movement in space. Overall, body position sense is a complex sensory and neural process that involves multiple inputs and processing centers in the brain.
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a 50 kg ice skater spins about a vertical axis through her body with her arms horizontally outstretched, making 2.5 turns each second. the distance from one hand to the other is 1.50 m . biometric measurements indicate that each hand typically makes up about 1.25 % of body weight.what horizontal force must her wrist exert on her hand?
The horizontal force that her wrist must exert on her hand is 2,128 N.
How we determine horizontal force?Consider the rotational motion of the ice skater and the forces acting on her body.
The centripetal force required to keep the ice skater moving in a circle is provided by the tension force in her arms.
We can use the following equation to find the tension force:
F = mω²r
where F is the tension force, m is the mass of the ice skater, ω is the angular velocity (in radians per second), and r is the radius of the circle formed by the outstretched arms (i.e., half the distance between the hands).
First, let's calculate the radius:
r = 1.50 m / 2
= 0.75 m
Next, let's calculate the angular velocity:
ω = 2.5 turns/s x 2π radians/turn = 15.7 radians/s
Now, let's calculate the mass of the ice skater's hands:
m_hands = 0.0125 x 50 kg = 0.625 kg
Finally, let's use the equation above to find the tension force:
F = mω²r = (50 kg + 2 x 0.625 kg) x (15.7 radians/s)² x 0.75 m
= 2,128 N
Therefore, the horizontal force that her wrist must exert on her hand is 2,128 N.
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what current is required in a loop of wire with radius 0.035 m to generate a magnetic field of strength 24e-6 t at the center of the loop?
To generate a magnetic field of strength 24e-6 T at the center of the loop, a current of approximately 4.4 A is required in a loop of wire with a radius of 0.035 m.
The magnetic field generated by a current-carrying loop of wire depends on the current and the geometry of the loop. The magnetic field strength at the center of the loop is given by the formula B = μ₀I/(2r), where B is the magnetic field strength, μ₀ is the magnetic constant (equal to 4π x 10^-7 T m/A), I is current, and r is the radius of the loop. In this case, we are given the magnetic field strength B and the radius of the loop r, and we want to find the current I that will produce that field strength. Rearranging the formula, we get I = 2Br/μ₀. Plugging in the given values, we get I = 2 x 24e-6 T x 0.035 m / (4π x 10^-7 T m/A), which simplifies to 1.2 A. Therefore, a current of 1.2 A is required in the loop of wire to generate a magnetic field of strength 24e-6 T at the center of the loop.
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during a process, 5 kj of heat is added to a closed system, and the system does 2 kj of work on the surroundings. what is the change of the internal energy of the system? here, neglect change in the bulk energy
The change in the internal energy of the system can be calculated using the first law of thermodynamics, which states that the change in the internal energy of a system is equal to th added to the system minus the work done by the system on the surroundings.
The formula for this is:ΔU = Q - W where ΔU is the change in internal energy, Q is the heat added to the system, and W is the work done by the system on the surroundings. In this case, 5 kJ of heat is added to the system, and the system does 2 kJ of work on the surroundings. Therefore, the change in internal energy is:ΔU = Q - WΔU = 5 kJ - 2 kJΔU = 3 kJSo, the change in the internal energy of the system is 3 kJ.
The change in internal energy of the system can be calculated using the first law of thermodynamics: ΔU = Q - W, where ΔU is the change in internal energy, Q is the heat added to the system, and W is the work done by the system. In this case, Q = 5 kJ and W = 2 kJ.
So, ΔU = 5 kJ - 2 kJ = 3 kJ.
The change in the internal energy of the system is 3 kJ, considering we neglect the change in the bulk energy.
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