Answer: 38% efficiency
Explanation:
Given:
- Mass of box, 500.0kg
- Height lifted, 3.50m
- Force Applied, 10 000N
- Distance applied, 4.50m
Required:
% Efficiency, can be found through formula η = [useful energy output (Eout) ÷ energy input (Ein)] x100%
To calculate Eout, you need to find which energy transferred to the box is useful. In this case, it is the gravitional potential energy, which can be found by the formula Eg = mgh, where Eg = (500.0)(9.8)(3.50) = 17150J.
To calculate Ein, find the total energy that was inputted to the object, given by W = FΔd, where W = 45000J.
Now, plug in the values to the %eff formula:
(17150J ÷ 45000J) x100% ≈ 38%
Therefore % efficiency of the pulley is 38%.
Which of the four numbered galaxies have ongoing star formation?.
The image here is not found here but star formation is characterized by clouds of dust where stars are born.
What is star formation?Star formation is a physical phenomenon where molecular clouds in space need to collapse to generate stars.
Stellar evolution is a process that initiates when a star is formed and ends when it dies (formation of a red giant).
Stars can be generated inside clouds of dust which are dispersed in different types of galaxies in the universe.
Learn more about star formation here:
https://brainly.com/question/7467199
Throughout the reflection, make sure you have a copy of the student guide and your data tables. use the drop-down menus to complete the statements. in part i, the independent variable was . in part ii, the independent variable changed to . the dependent variable for both part i and part ii was .
Mass, Speed and Kinetic Energy.The independent variable changed to . the dependent variable for both part i and part ii was .
What is kinetic energy?We can solve this by analysing the choices and the relations between variables.
It's worth noting that Kinetic Energy is proportional to both speed and mass. Actually, Kinetic Energy is exactly proportional to those factors, meaning that the more mass or speed, the higher the Kinetic Energy.
Having said that, Part I and Part II must have speed and mass as indendepent variable, because Kinetic Energy depends on them.
Then, in the third question, the answer is Kinetic Energy becase that's the dependent variable in both cases Part I and Part II.
Just to remember, the Kinetic Energy is defined as
[tex]KE=\dfrac{1}{2}mv^2[/tex]
Where you can notice the relation between mass, speed and kinetic energy.
Therefore, the right answer are Mass (Part I), Speed (Part II) and Kinetic Energy (Part III).
To know more about Kinetic energy follow
https://brainly.com/question/25959744
Answer
the right answer are Mass (Part I), Speed (Part II) and Kinetic Energy (Part III).
Explanation:
A pebble of mass 50g is moving with a velocity of 20m/s.What is its kinetic energy?
[tex] \bf\sf \underline{Given: - }[/tex]
[tex] \text{Mass of pebble= 50g}[/tex][tex] \text{Velocity of pebble= 20m/s}[/tex][tex] \bf\sf \underline{To \: Find: - }[/tex]
[tex] \text{Kinetic Energy of Pebble}[/tex][tex] \bf\sf \underline{Solution: - }[/tex]
We know that, to find the Kinetic energy we are required mass and velocity and Here Both parameters are provided But mass is in gram so we need change it into kg,
1g = 0.001kg,
⠀⠀⠀50g = 0.05g
Now we know the formula of Kinetic energy,
[tex] \sf \boxed{ \star\bf{\: Kinetic \: energy = \frac{1}{2} m {v}^{2}}} \\ \\ \qquad \qquad = \frac{1}{ \cancel2} \times 0.05 \times \cancel{20}\times 20 \\ \\ \qquad \qquad =0.05 \times 200 \\ \\ \qquad \qquad \sf = 10J \: [/tex]
Hence, the kinetic energy of the pebble is 10J.
The speed of sound in ice, water, and steam is shown.
A 3 column by 4 row table. Column 1 is titled Medium and includes the following entries: Ice, Water, Steam. Column 2 is titled Temperature (degrees Celsius) and includes the following entries: 0, 25, 100. Column 3 is titled Speed of Sound (meters per second) and includes the following entries: 3200 meters per second, 1500 meters per second, 346 meters per second.
What best explains the speed of sound in different states of matter?
Sound travels fastest in ice because energy is easier to transfer when the molecules are close together.
Sound travels slowest in steam because the sound has to move around the gas molecules that are far apart.
Sound travels fastest in ice because the temperature of solids is always greater, so the heat transfers the sound energy.
Sound travels slowest in steam because the pressure is so great the sound cannot travel though the steam particles.
Answer:
Sound travels fastest in ice because energy is easier to transfer when the molecules are close together.
Explanation:
The statement which best explains the speed of sound in different states of matter is that sound travels fastest in ice because energy is easier to transfer when the molecules are close together. Thus, the correct option for this question is A.
What is the effect of sound travel on ice?In ice, the atoms are present close to each other. It facilitates the transfer of sound waves in the ice medium. The closer the atoms are to each other, the higher the pitch, and vice versa.
As in ice, the high-frequency sound waves propagate faster; hence that high tone right at the start rapidly drops in pitch. The high-frequency vibration hits your ear first, with the low-frequency tone right on its heels.
In ice, the interaction of sound with the ice affects transmission loss. While in steam the atoms are far apart due to which the waves do not propagate successfully.
Therefore, sound travels fastest in ice because energy is easier to transfer when the molecules are close together. Thus, the correct option for this question is A.
To learn more about Sound transmission, refer to the link:
https://brainly.com/question/18451537
#SPJ2
Which layer of the sun is where plasma rises and sinks due to temperature differences?.
Answer:
Just beneath the photosphere, and extending inward to about 0.7 Rsun, is the convection zone. Energy generated in the core of the Sun moves outward through this layer by a boiling motion in which hot plasma rises, releases some of its energy, cools, and then sinks again.
Explanation:
is it possible to put negative and positive charge at same time at electroscope leaves?
Answer:
No
Explanation:
If a positively charged object is brought near a negatively charged electroscope, it will attract some of the excess electrons up the stem and out of the leaves, causing the leaves to come slightly together
The dwarf planet Pluto was discovered in 1930. Since that time, which jovian planet has completed a full revolution around the Sun?
Answer:
Explanation:
Uranus takes about 84 years to circle the sun.
Pluto's existance has been known for 92 years. Uranius has completed 1 complete revolution. The numbers are reasonably close together and so Uranius is the answer.
A spacecraft flies within 500,000 km of each of these planets. Based on its mass, which planet would gravitationally attract the spacecraft the least?
Answer:
Mars
Explanation:
It would be Mars because Mars has the least mass out of al the planets in the Solar System, and that would affect its gravitational pull.
I hope it helps! Have a great day!
Anygays-
Question 20 I need help ASAP!!
Answer:
1.) Gas = Are the particles moving quickly in a radom pattern?
2.) Plasma = Are the particles electrically charged?
3.) Solid = Are the particles vibrating in a fixed position?
4.) Liquid = Are the particles sliding past each other?
Hope this helps!
Which statement is true about the reaction shown by this chemical equation?
HCI + NaOH – NaCl + H20
O A. It is exothermic.
O B. It is a synthesis reaction.
O C. It is endothermic.
D. It is a combustion reaction.
SUBMIT
The given reaction, HCl + NaOH --- NaCl + H₂O is an example of an exothermic reaction. Hence, option A is correct.
What is an exothermic reaction?In a reaction, the energy released in the form of heat is called an exothermic reaction. In an exothermic reaction, the heat energy is transferred to the surroundings. The chemical equation is Reactant = Product + Energy.
The energy absorbed from the surroundings is called an endothermic reaction. The heat energy taken from the reactants to form a product is called an endothermic reaction. It is described by the chemical equation as Reactant + Energy = Product.
From the given reaction,
HCl + NaOH --- NaCl + H₂O
HCl and NaOH is reactant and NaCl and water is a product. When strong acid (HCl) is mixed with a strong base (NaOH), it gives sodium chloride(NaCl) and water along with heat energy.
When the product is formed from the reactant, heat energy is released. This reaction is also called a Neutralisation reaction. The neutralization reaction are exothermic reaction, that forms chemical bonds by the release of energy.
When water is formed as a product by the release of greater energy than the energy absorbed is called a Neutralization/ exothermic reaction. Hence, the correct option is A) It is exothermic.
To learn more about Exothermic and endothermic reactions:
https://brainly.com/question/27570614
#SPJ5
True or False : If a car drives on a road for a nonzero amount of time, then its average velocity must be nonzero.
Answer:
Your answer would be:
B.) False
If a car drives on a road for a nonzero amount of time, then its average velocity must be nonzero.
If a car drives for a nonzero amount of time, then its average acceleration must be nonzero.
Explanation:
Have a great rest of your day
#TheWizzer
Question 5 of 10
Why does a patient receive more radiation from a CT scan than from having an X-ray image made?
A. A CT scan involves multiple X-ray images.
B. Higher-frequency rays are used in a CT scan.
C. Fewer X-rays are reflected in a CT scan.
D. The X-rays are more powerful in a CT scan.
Answer: A CT scan involves multiple X-ray images.
Answer: A CT scan involves multiple X-Ray images
Explanation:
I did it and it was correct
. A marble sphere with a diameter of 1/4 inch is fully immersed in the oil of density 0.961 g/cm3 . Calculate the buoyant force exerted on the marble sphere by the oil.
Answer:
See below ( was it REALLY 1/4 INCH??)
Explanation:
Calculate the volume of the sphere
v = 4/3 pi r^3
this times the density of the oil will give g displacement
then f = ma
4/3 pi (.25 in * 2.54 cm/inch) ^3 * .961 = 1.0307 gm
1.0307 gm is .0010307 kg
f = ma = .0010307 * 9.8 = .0101 N
A piece of zinc was lying outside and had a temperature of 26 degrees C. Later that day the sun came out and the temperature increased to 36 degrees C. If the piece of zinc is only 0. 15 kg, find the thermal energy. NOTE: Zinc has a specific heat of 380 J/kg degrees C). I need The Equation used and The Answer
Answer: 570 J
Explanation:
The amount of heat gained by the piece of zinc can be calulctaed using ∆Q = mc∆T
=> ∆T = 36-26 = 10°C
m = 0.15 kg, s = 380J/kg/°C
=> ∆Q = 0.15 x 380 x 10
= 570J
If you want to find stars that are just being born, where are the best places to search?.
Answer:
In giant molecular clouds
Explanation:
To find the stars that are just being born, one of the best places to search is giant molecular clouds.
What is a Star?An astronomical object known as a star is made up of a luminous plasma spheroid that is held together by gravity. The Sun is the star that is nearest to Earth. Other stars are also visible at night with the eye, but because of their great distances from Earth, they appear as stationary points of light.
Many of the brightest stars have names, and the most notable stars have been organized into constellations and asterisms. Star catalogs have been put out by astronomers that list the known stars and provide standardized stellar labels. An estimated 10²²–10²⁴ stars are alive in the observable cosmos.
These stars are all situated within the Milky Way galaxy, with only 4,000 of them being visible with the unaided eye.
To know more the about star:
https://brainly.com/question/29008154
#SPJ5
A circular loop of wire 75 mm in radius carries a current of 113 A. Find the (a) magnetic field strength and (b) energy density at the center of the loop.
The magnetic field strength is 9.47 ×10⁻⁴ T
The energy density at the center of the loop is 0.36 J/m³
Calculating Magnetic field strength & Energy densityFrom the question, we are to find the magnetic field strength
The magnetic field strength of a loop can be calculated by using the formula,
[tex]B = \frac{\mu_{0} I}{2R}[/tex]
Where B is the magnetic field strength
[tex]\mu_{0}[/tex] is the permeability of free space [tex](\mu_{0}=4\pi \times 10^{-7} \ N/A^{2})[/tex]
[tex]I[/tex] is the current
and R is the radius
From the give information,
[tex]R = 75 \ mm= 75 \times 10^{-3} \ m[/tex]
and [tex]I = 113 \ A[/tex]
Putting the parameters into the formula, we get
[tex]B = \frac{4\pi \times 10^{-7} \times 113}{2 \times 75 \times 10^{-3} }[/tex]
[tex]B = 9.47 \times 10^{-4} \ T[/tex]
Hence, the magnetic field strength is 9.47 ×10⁻⁴ T
Now, for the energy density
Energy density can be calculated by using the formula,
[tex]u_{B} = \frac{B^{2} }{2\mu_{0} }[/tex]
Where [tex]u_{B}[/tex] is the energy density
Then,
[tex]u_{B}= \frac{(9.47\times 10^{-4} )^{2} }{2 \times 4\pi \times 10^{-7} }[/tex]
[tex]u_{B} = 0.36 \ J/m^{3}[/tex]
Hence, the energy density at the center of the loop is 0.36 J/m³
Learn more on Magnetic field stregth & Energy density here: https://brainly.com/question/13035557
An incompressible ideal fluid flows steadily through a pipe that has a change in diameter. The fluid speed at a location where the pipe diameter is 8.0 cm is 1.28 m/s. What is the fluid speed at a location where the diameter has narrowed to 5.0 cm
Answer:
A V = A X / t where X / t is speed of fluid
A V = area * velocity (rate of fluid flowing)
A1 V1 = A2 V2 form of equation of continuity
pi (D1 / 2)^2 V1 = pi (D2 / 2)^2 V2
V2 = (D1 / D2)^2 * V1 = (8 / 5)^2 * 1.28 m/s = 3.28 km/s
An object with a mass of 2.0 kg accelerates 8.3 m/s? when an unknown force is applied
to it. What is the amount of the force?
Answer:
16.6 NExplanation:
We know the relation :
Force = Mass x AccelerationWe are given that :
Mass = 2.0 kgAcceleration = 8.3 m/s²Hence, on substituting the values in the equation :
F = 2.0 x 8.3F = 16.6 NThe given information is,
→ Mass = 2 kg
→ Acceleration= 8.3 m/s
→ Force = F (in Newton)
Now we have to find the,
→ Amount of force applied to the object.
Formula we use,
→ F = Mass × Acceleration
Then the amount of force will be,
→ F = Mass × Acceleration
→ F = 2 × 8.3
→ [ F = 16.6 N ]
Hence, the amount of force is 16.6 N.
Which of the following processes is more easily observable for light with a short wavelength?
help please.
Answer:
Option B
Explanation:
Option B
Answer is PHOTOELECTRIC EFFECT
Which of the following is true about the Sun?
A.
The Sun is the only star in the Solar System.
B.
The Sun is the only star in the Milky Way.
C.
The Sun is not a star.
D.
The Sun is the only star in the universe.
A sound wave, generated at a frequency of 440 hertz has a wavelength of 2.3 meters as it travels through a solid material. The approximate speed of the wave is ____ m/sec.
The approximate speed of the sound wave traveling through the solid material is 1012m/s.
Wavelength, Frequency and SpeedWavelength is simply the distance over which the shapes of waves are repeated. It is the spatial period of a periodic wave.
From the wavelength, frequency and speed relation,
λ = v ÷ f
Where λ is wavelength, v is velocity/speed and f is frequency.
Given the data in the question;
Frequency of sound wave f = 440Hz = 440s⁻¹Wavelength of the wave λ = 2.3mSpeed of the wave v = ?To determine the approximate speed of the wave, we substitute our given values into the expression above.
λ = v ÷ f
2.3m = v ÷ 440s⁻¹
v = 2.3m × 440s⁻¹
v = 1012ms⁻¹
v = 1012m/s
Therefore, the approximate speed of the sound wave traveling through the solid material is 1012m/s.
Learn more about Speed, Frequency and Wavelength here: brainly.com/question/27120701
How is "one second time" defined in SI system?
Answer:
Since 1997: A second is a time equal to 9,192,631,770 periods of radiation corresponding to the transition between two hyperfine levels of the ground state of the cesium-133 atom.
This definition refers to a caesium atom at rest at a temperature of 0 K
Explanation:
Reducing access to waterways will lead to an increase in human impact on waterways. please select the best answer from the choices provided t f
Answer:
F
Explanation:
Reducing access will cause less damage to occur
Answer: the answer is false
THE RESPIRATORY SYSTEM - 3/3
11. The epiglottis closes when someone swallows to protect the lungs?
True or False
12. Drinking too much alcohol can cause snoring due to a relaxation in which part of the respiratory system?
uvula
epiglottis
pharynx
larynx
13. What is analogous to the structure of the respiratory system?
an upside-down deciduous tree
the solar system
the Mississippi River, delta, and the Gulf of Mexico
the archipelago of islands that make up Hawaii
14. Which type of disease is characterized by a progressive obstruction of exhalation mechanisms?
pneumonia
COPD
asthma
dyspnea
Answer:
11. true
12.
13. an upside down tree
14. copd
Write your own real-world scenario where the Pythagorean Theorem can be applied to find a missing piece. You may choose to write a problem that is two- or three-dimensional in nature. Be sure that you will be able to draw a diagram of your scenario.
Write out your problem and submit it for Part 1. Be sure to end your scenario with a question
Answer:
hey
Explanation:
Displacement covered by the man calculated by using Pythagoras theorem is 10 km.
What is Pythagoras Theorem ?Pythagoras theorem states that, for a right-angled triangle, the square of the hypotenuse side is equal to the sum of squares of the altitude and base sides.
Here,
The Pythagoras Theorem can be written as,
c² = b² + a²
where c is the hypotenuse, b is the base and a is the altitude of the triangle.
An example of application of the Pythagoras theorem is,
A man started walking from his home and covered a distance of 8 km towards the east and then turned right and walked a distance of 6 km towards the south, what is his displacement now from his starting point ?
A line drawn from his current position and his initial point represents the displacement covered by the man.
Let the starting point be A, then he walks to the point B and then he turns right and walks upto the point C.
Drawing a figure including all the data, we get a right angled triangle, ABC. So,
The base of the triangle, BC = 6 km
Altitude of the triangle, AB = 8 km
The displacement of the man = hypotenuse of the triangle
d = AC
According to Pythagoras Theorem,
AC² = BC² + AB²
AC² = 6² + 8² = 100
AC = √100
Therefore, displacement, d = AC = 10 km.
Hence,
Displacement covered by the man calculated by using Pythagoras theorem is 10 km.
To learn more about Pythagoras theorem, click:
https://brainly.com/question/343682
#SPJ7
Attaching the image file here.
Why do planets like Jupiter and Saturn have large gas atmospheres while Mercury and Mars do not?
options:
Because Jupiter and Saturn have more mass
Because of each planets distance from the Sun
Because of their different orbits around the Sun
Because they were formed at different times
The solar system shows the planets in their orbits around the sun in this order: Mercury, Venus, Earth with Moon, Mars, Jupiter, Saturn. Fixed stars are around the outside of the orbit of Saturn.
Explanation:
Aristarchus of Samos was an ancient Greek astronomer and mathematician who presented the first known heliocentric model that placed the Sun at the center. So I had to choose the choice that was most similar to that.
A 3.00 kg bucket of water is raised with an upward acceleration of 2.20 m/s2 from a well by means of an attached rope. What is the tension in the rope
Answer:
F = M a
M = 3 kg
a = 2.2 m/s^2
T = tension in rope
T - M g = M a Where T - M g is the net force on the bucket
T = M (g + a) = 3 kg * (9/80 + 2.20) m/s^2 = 36 Newtons
HELP PLS HELP. WILL GIVE BRAINLIEST.
You are trying to roll a toy car up a hill and stop at the top without rolling down the other side of the hill. If the car has a mass of 0.5 kg and the hill is 0.07 meters high, how much kinetic energy should you use on the car to move it to the exact top?
Let's see
According to law of conservation of linear momentum
PE=KEKE=mghKE=0.5(9.8)(0.07)KE=4.9(0.07)KE=0.343JKE=343mJAnswer:
0.35 J
Explanation:
This problem requires the Law of Conservation of Energy.
⇒ Potential energy = Kinetic Energy
⇒ mgh = 1/2mv²
⇒ 0.5 x 10 x 0.07 = KE
⇒ KE = 5 x 0.07
⇒ KE = 0.35 J
Angie, brad, and carlos are discussing a physics problem in which two identical bullets are fired with equal speeds at equal-mass wood and steel blocks resting on a frictionless table. One bullet bounces off the steel block while the second becomes embedded in the wood block. All the masses and speeds are the same, says angie, so i think the blocks will have equal speeds after the collisions. But what about momentum? asks brad. The bullet hitting the wood block transfers all its momentum and energy to the block, so the wood block should end up going faster than the steel block. I think the bounce is an important factor, replies carlos. The steel block will be faster because the bullet bounces off it and goes back the other direction.
Answer:
Momentum must be conserved in the collision.
The steel block must move faster after the collision to preserve momentum.
If the steel block is moving faster it will aso have more kinetic energy.
(Note; If the bullet hits the steel block it will have some momentum in the reverse direction and thus have a greater change in total momtntum than the bullet that becomes imbedded in the wood block)
what would happen in a capacitor if the dielectric was not made out of an insulator
[tex]
\mathbb \blue{Answer }[/tex]
[tex]Introducing \: \: a \: dielectric \: \: into \: \\ a \: \: capacitor \: \: decreases \: \: \\ the \: \: electric \: \: field, \: \: \\ which \: \: decreases \: \: the \: \: \\ voltage, \: \: \ which \: \: increases \: \: the \: \: \\ capacitance. \: \: A \: capacitor \: \: with \: a \: \\ dielectric \: \: stores \: the \: \\ same \: \: \ charge \: \: as \: one \: \\ without \: \: a \: dielectric, \: but \: at \: \\ a \: \: lower \: \: voltage. \: \: \\ Therefore \: \: a \: \: capacitor \: \: with \: \: a \: \\ dielectric \: \: in \: \: it \: \\ is \: \: more \: \: effective \: [/tex]
[tex]\mathbb \blue{ I \: hope \: it's \: helpful \: \: for \: you }[/tex]
,,,,,,,,,,,,,,,,,,,,,,,,,