Answer:
The only way to increase the work output is to increase the work input. You can't get more work out of a machine than you put into it. The moving parts of a machine must use some of the work input to overcome friction. Because of friction, the work output of a machine is always less than the work input.
Explanation:
PHYSICS GIVING LOTS OF POINTS!!! 100
The number of protons in the nucleus of an atom determines the species of the atom, i.e., the element to which the atom belongs. An atom has the same number of protons and neutrons. But the electron number cannot be used instead because
electrons are not within the nucleus
electrons are negatively charged
electrons can be removed from or added to an atom
electrons are lighter than protons
Answer:
electrons can be removed or added creating ions of the element
Explanation:
Describe each step of mitosis
Answer:
prophase, prometaphase, metaphase, anaphase, and telophase
Explanation:
Glass does not transmit ultraviolet radiation. Suggest what happens to ultraviolet radiation when it is incident on glass. (1 mark)
Answer:
Most of UV radiation is stopped by glass & this is why you will not get sunburns behind a glass. The glass simply filters out the UV radiation that is responsible for the sunburns & protect your skins from these energetic & somewhat harmful radiation
Explanation:
UV radiation with a 200 nm wavelength shines on a gold electrode in a photoelectric cell. What is the maximum kinetic energy, in eV, of photoelectrons ejected from the gold
For a UV radiation with a 200 nm wavelength is mathematically given as the maximum kinetic energy, in eV, of photoelectrons ejected from the gold
K.E=1.779*10^{19}J
K.E=1.112ev
What is the maximum kinetic energy, in eV, of photoelectrons ejected from the gold?
Generally, the equation for the photo electric equation is mathematically given as
[tex]hc/\lambda=K.E+\phi[/tex]
Therefore
K.E=(6.626*10^{-34}*3*10^8/2*10^{-7})-5.1*1.6*10^{-19}
K.E=1.779*10^{19}J
In conclusion, in eV, of photoelectrons ejected from the gold
K.E=1.112ev
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If an asteroid with a diameter of 1 km strikes the earth, how big of a crater will it make?.
An asteroid with diameter of 1 km will have a crater of 5.236 x 10⁸ m³ volume when it strikes the earth.
Volume of crater made by the asteroidThe impact created by an asteroid when it strikes the earth depends on several factors such as the size of the asteroid.
The bigger the diameter of the asteroid the bigger the crater volume it will make when it strikes the earth.
Assuming the asteroid to be spherical, volume of the crater is calculated as follows;
V = 4/3πr³
Where;
r is radius of the sphere = 500 mV = 4/3π(500)³
V = 5.236 x 10⁸ m³
Thus, an asteroid with diameter of 1 km will have a crater of 5.236 x 10⁸ m³ volume when it strikes the earth.
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When looking at a velocity vs. time graph, the ___ is equal to the displacement .
Answer:
area bound by the line and the axes???
Explanation:
The force between two charged objects is equal to 400 N. What will be the force between the two objects if the charge on both objects is doubled?
The electrical force between 2 objects is 400 N. According to Coulomb's law, if both charges are doubled, the electrical force will be 1600 N.
What does Coulomb's law state?The electrical force between 2 charged objects is directly proportional to their charges and inversely proportional to the square of the distance between them.
The electrical force between 2 objects is 400 N. Due to the direct proportionality, if the charge of both objects is doubled (multiplied by 2), the total force will be multiplied by 4.
F = 2 × 2 × 400 N = 1600 N
The electrical force between 2 objects is 400 N. According to Coulomb's law, if both charges are doubled, the electrical force will be 1600 N.
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can we see a halo around the half moon?
Answer:
No we cannot
Explanation:
But what causes a ring to appear around the moon? This phenomenon is called a "moon halo." According to the National Weather Service, this ring of light, which is actually an optical illusion, forms around the moon when moonlight refracts off ice crystals in cirrus clouds, high up in the Earth's atmosphere.
A student uses the right-hand rule as shown. an illustration with a right hand with fingers curled and thumb pointed up. what is the direction of the magnetic field in front of the wire closest to the student? up right down left
The direction of the magnetic field in front of the wire closest to the student is on the left. The direction is found by the right-hand rule.
What is the right-hand rule?The right-hand rule is a popular mnemonic for remembering how axes in three-dimensional space are oriented.
The fact that the three axes of three-dimensional space have two different orientations gives birth to the majority of the many left-hand and right-hand rules.
Using the right-hand rule, we can recall this diagram. Your thumb points in the direction of the magnetic force pushing on the moving charge
If you point your pointer finger in the direction of the positive charge and then your middle finger in the direction of the magnetic field.
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Answer:
left
Explanation:
edge 2022
Because sound waves vibrate longitudinally, what can result?
A Disruptions of fixed waves
B. Changes in the density of air
С. Pressure differences where compressions are rarefied
D Regions of high pressure and low pressure
I NEED HELP ASAPPP!!!!!!!! someone help me!!! :(
Write equations for both the electric and magnetic fields for an electromagnetic wave in the red part of the visible spectrum that has a wavelength of 725 nm and a peak electric field magnitude of 2. 9 V/m. (Use the following as necessary: t and x. Assume that E is in volts per meter, B is in teslas, t is in seconds, and x is in meters. Do not include units in your answer. Assume that E
The peak magnetic field of the electromagnetic wave in the red part of the visible spectrum is 9.67 x 10⁻¹⁰ T.
Relationship between electric and magnetic field
The relationship between electric and magnetic field at a given peak electric field is given as;
c = (E₀) / (B₀)
where;
c is speed of lightE₀ is the peak electric fieldB₀ is the peak magnetic fieldB₀ = E₀ / c
B₀ = (2.9) / (3 x 10⁹)
B₀ = 9.67 x 10⁻¹⁰ T
Thus, the peak magnetic field of the electromagnetic wave in the red part of the visible spectrum is 9.67 x 10⁻¹⁰ T.
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The main difficulty with multiple star systems such as Alpha Centauri as places to look for life is that: _________
Answer:
The conditions for life are extremely specific and the search is extremely broad.
Explanation:
in order to sustain life, the planet has to have water.
Too hot and the water will evaporate too cold and the water will freeze, this is based on the planet's distance from the sun and its solar mass. (The mass compared to our sun) If the solar mass is double that of our sun then the planet would have to be double the distance from the sun in order to sustain life and keep the water from evaporating. Let me Know if This helps
This property of matter describes
a substance's ability to be
stretched thin?
Answer:
Ductility
Explanation:
is the physical property of a material associated with the ability to be hammered thin or stretched into wire without breaking. A ductile substance can be drawn into a wire.
What do Jupiter, Neptune, and Saturn have in common?
Answer:
There are not close to the sun, outer planets, and have rings
Explanation:
Current 1 of 8.4 A runs for 240 seconds and then stops. Current 2 is 10.5 A. How long does current 2 have to run to deliver the same amount of charge as current 1? 88.2 s 192 s 2016 s 21,000 s
Answer:
The charge of a current in a given period of time is calculated by multiplying the current and the duration of that current. Since in the problem charge would be constant, we can relate the first conditions to the second conditions.
q = IT
q1 = q2
I1T1 = I2T2
8.4(240)=(10.5)(T2)
T2 = 192 seconds
True or False: If you cut a bar magnet in half, you will get a magnet that is only a north pole and a magnet that is only a south pole.
Answer: False
Explanation:
That is false. This is implying the existence of magnetic monopoles, which we do not know exist. As far as we know, magnetic monopoles don't exist and its impossible to create one. Due to Maxwell's equations, it implies that a magnetic monopole should exist, but we have not yet found one.
Lesson 18, Physical Science
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Q1. Describe how the skater's kinetic and potential energy change as the skater descends. Explain what happens to the total energy (potential energy + kinetic energy) in terms of the Law of Conservation of Energy.
Change the skater with the "Choose Skater" button.
Q2. Describe any changes to the bar graphs you see when you change skaters. Is the Law of Conservation of Energy still obeyed?
Reset the half-pipe and click on the "Show Grid" check box. Grab the track (drag the track with a right-click) and set the bottom of the track at "zero" height.
Select the default, 75 kg, PhET skater and set him at 5.0 meters above the zero and allow him to skate.
Q3. How much potential energy does the skater have at 5.0 meters? How much kinetic energy does the skater have at 0.0 meters?
Q4. If a 20.0 kg skater started his skate at 10 meters height (on Earth):
How much potential energy would the skater have at the start of skating?
How much kinetic energy would the skater have at the start of skating?
How much potential energy would the skater have at zero height?
How much kinetic energy would the skater have at zero height?
Create this skate path:
Start the skater on the left side and observe. Then answer the following question:
Q5. Does the skater have enough energy to make it all the way to the right side? Explain why or why not.
If the skater starts on the left on the following path:
Q6. Answer the parts of this question based upon the above skater path. If the skater starts at point "A":
Where does the skater have the maximum potential energy?
Where does the skater have the minimum potential energy?
Where does the skater have the minimum kinetic energy?
Where does the skater have the maximum kinetic energy?
At which two points would the skater have about the same kinetic energy?
Q7. Based upon the equation for potential energy, how do you expect the potential energy to change when the gravity is lower than it is on Earth (for example, gravity on the moon is 1.6 m/s2 )?
Use the option boxes to move the skater to Jupiter, where acceleration due to gravity is 26 m/s2.
Q8. Describe any differences you see in potential and kinetic energy between the Earth and Jupiter.
Use the option boxes to move the skater to the moon where the acceleration from gravity is 1.6 m/s2.
Q9. Describe any differences you see in potential and kinetic energy between the Earth and the moon.
Q10. Does this agree with the prediction you made in Q7?
Q11. How high must a 20 kg skater start at to have a kinetic energy of 360 joules at a height of 0 meters?
Q12. What is the total energy of the 60.0 kg skater before she starts her ride, 12 meters above the ground?
Q13. If you throw a 2.0 kg basketball straight up in the air, at what height will the basketball have 160 J of potential energy?
Q14. Describe what happens to the bar graphs when you change the amount of friction. Is the Law of Conservation of Energy still obeyed?
The kinetic energy of the skater would increase while his potential energy would decrease as he descends from top to bottom.
What is the law of conservation of energy?The law of conservation of energy states that the energy possessed by a physical body can neither be created nor destroyed, but it can only be converted (transformed) from one form of energy to another.
Based on the law of conservation of energy, the total energy (potential energy + kinetic energy) would always remain constant because it is conserved.
The potential energy of this skater at a height of 5.0 meters is given by:
PE = mgh
PE = 75 × 9.8 × 5.0
PE = 3,675 Joules.
Also, the kinetic energy of this skater at a height of 0.0 meters would be equal to zero assuming it is at rest.
In conclusion, the potential energy possessed by a physical body is highly dependent on its height while kinetic energy depends only on motion, regardless of height.
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A boy holds a toy soldier in from of a concave mirror. The focal length of the mirror is 0.45 m and the boy holds the toy soldier at a distance of 0.25m from the mirror. Find the image distance.
A collision is elastic only when kinetic energy and momentum are conserved through the collision. Group of answer choices True False
Answer:
Both momentum and kinetic energy are conserved quantities in elastic collisions.
Explanation:
An elastic collision is a collision in which there is no net loss in kinetic energy in the system as a result of the collision.
Which is a type of electromagnetic wave? A. Sound wave B. Wave in a spring C. Ocean wave D. infrared wave
Answer:
D. infared waveExplanation:
The electromagnetic spectrum consists of :
Radio wavesMicro wavesInfared wavesVisible light wavesUV raysX-raysGamma raysThe formation of fossil fuels is a process that takes millions of years and starts with energy from the Sun. The Sun contributes to the formation of fossil fuels by –
Answer:
Photosynthesis
Explanation:
It is captured through photosynthesis and that helps the formation of fossil fuels.
I hope it helps! Have a great day!
Anygays-
The formation of fossil fuels is a process that takes millions of years and starts with energy from the sun, and the sun contributes to the formation of fossil fuels by providing sunlight so that microbes can convert it into coal and other organic matters.
What role does the sun play in fossil fuels?The sun does play a role in the formation of fossil fuels, such as coal, oil, and natural gas, and the decay of organic matter, such as dead plants and animals, accumulates over millions of years and apart from that, solar energy is captured by plants through the process of photosynthesis, which converts sunlight into energy that the plant can use to grow.
Hence, the sun contributes to the formation of fossil fuels by providing sunlight so that microbes can convert it into coal and other organic materials, which can be further used.
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Which object had more potential energy when it was lifted to a distance of 1000 centimeters? Show your calculation.
PLEASE HELP IM OFFERING *15 POINTS*
Explanation:
We Know That
POTENTIAL ENERGY= MASS*g*HEIGHT
When the objects are lifted to same height then the object with heavier mass would have the highest potential energy
.
Evelynn is measuring the pitch of a piano note. What unit of measurement is she most likely recording her value
in?
O hertz
decibels
Ofrequency
amplitude
Answer:
hertz
Explanation: play piano
What type of corrective lenses would an eye doctor most likely prescribe for a patient with astigmatism?.
Is there effect of friction on mechanical advantange
Answer:
Most certainly yes
Explanation: First you have to define what friction is "A force that resist motion" while Mechanical advantage " is simply a measure of the output force to the input force". Hence in a mechanical system if you increase friction in the system, it reduces the mechanical advantage and vice versa.
true or false. Revolution is the movement of Earth around the sun.
This is science
Answer:
True
Explanation:
REVOLUTION is the time it takes to REVOLVE around the sun
ROTATION is the arth spinning on its axis every 24 hrs to make a day
if a plane is flying in the air and it crashes on the border of america and canada where do u bury the survivors
Answer:
Why would you bury the survivors? LOL
Answer:
you dont bury the surviors because they are alive.
Explanation:
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An fm radio station broadcasts at a frequency of 101. 3 mhz. What is the wavelength?.
Answer:
2.96 m
Explanation:
Thus, the wavelength of the radio waves emitted by the FM broadcast station is 2.96 m
Three liquids are at temperatures of 13 ◦C, 19◦C, and 40◦C, respectively. Equal masses of the first two liquids are mixed, and the equilibrium temperature is 15◦C. Equal masses of the second and third are then mixed, and the equilibrium temperature is 36.9 ◦C. Find the equilibrium temperature when equal masses of the first and third are mixed. Answer in units of ◦C.
Answer:
2 C1 = 4 C2 heat loss = heat gain
C1 = 2 C2
17.9 C2 = 3.1 C3 mixing second and third
17.9 / 2 C1 = 3.1 C3 C1 for C2
17.9 C1 = 6.2 C3
C3 = 2.89 C1
C1 (T - 13) = C3 (40 - T) heat loss = heat gain
T - 13 = 2.89 (40 - T) = 115.5 - 2.89 T
3.89 T = 128.5
T = 33 deg C
When liquids A and D is added the temperature of the mixture will be θ= 36.71°C.
What is Temperature ?
Temperature is a physical quantity which measures hotness and coldness of a body. Temperature measures the degree of vibration of molecule in a body. Temperature is measured in centigrade (°C), Fahrenheit (°F) and Kelvin (K) in which Kelvin (K) is a SI unit of temperature. Absolute scale of temperature means Kelvin scale of temperature. relation between Kelvin(K) and centigrade (°C), °C= K - 273.15 from equation, 273.15 K means 0 °C, which is freezing point of water (ice).
Let m be the mass of each liquid and C₁,C₂,C₃ Be specific heat of liquid A,B,C Respective. When A and B are mixed. The final temperature is 15°C
∴ Heat gained by A= heat lost by B
i.e. mC₁(15−13)=mC₂(19-15)
5C₁ = 4C₂
C₂ = 5/4 C₁ ________1)
When B and C are mixed. The final temperature is 36.9°C
∴ Heat gained by B= heat lost by C
i.e. mC₂(36.9−19)=mC₃(40-36.9)
C₂17.9 = C₃3.1
C₃=5.77C₂_____2)
from equa. 1) and 2)
We get,
C₃=5.77(5/4 C₁)
C₃ = 7.21 C₁
When A and C is mixed let the final temperature be θ.
C₁(θ-13) = C₃(40-θ)
C₁(θ-13)=7.21 C₁(40-θ)
(θ-13)=7.21 (40-θ)
θ-13= 288.4-7.21θ
8.21 θ=288.4+13
8.21 θ= 301.4
θ= 36.71°CTo know more about temperature :
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What direction would the north pole of a bar magnet point if you were to hang the bar magnet from a thin string?.
Answer:
TOWARD the North pole.
Explanation: