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William Hood
what is the size of the force needed to change the momentum of an object 2000 kg m/s over a time period of 0.5 seconds?
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Julio Andersen
Which electrical device makes it possible to transmit electrical energy efficiently from a power plant to users?
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Micheal Haney
Starting from rest, a runner at a track meet reaches a speed of 7.5 m/s in 1.7 s. How far does she run during this time, assuming her acceleration is uniform?
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Danny
A lightbulb has an efficiency of 8.2%. How much light energy (not heat energy) is generated by the bulb every second if the bulb has a power of 21 W?
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Andrew
As you drive down the road, you see and hear an ambulance go by you in the

opposite direction. After it passes, how is the frequency you hear different

from that being produced by the ambulance?

O

A. It is higher due to the Doppler effect.

B. It is lower due to the Doppler effect.

O

C. It has not changed, as the two vehicles cancel each othe_out.

O

D. It depends on which vehicle is moving the fastest.
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Princess Irwin
Which wave has a disturbance that is perpendicular to the wave motion?

no wave has a disturbance that is perpendicular

transverse

surface

longitudinal
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Aliana Miles
How does the electron structure of an isolated atom differ from that of a solid material?
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Arnav Irwin
Why would you weigh more on saturn than on earth
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Jerome Livingston
A car is initially moving at 35 km/h along a straight highway. To pass another car, it speeds up to 135 km/h in 10.5 seconds at a constant acceleration.

(a) how large was the acceleration in m/s ^2

(b) how large was the acceleration, in units go g = 9.80 m/s ^2
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Gauge Cantrell
A copper block with a mass of 300 grams is cooled to 77 K by being immersed in liquid nitrogen. The block is then placed in a Styrofoam cup containing some water that is initially at + 50.0°C. Assume no heat is transferred to the cup or the surroundings. The specific heat of liquid water is 4186 J / (kg °C), of solid water is 2060 J / (kg °C), and of copper is 385 J / (kg °C). The latent heat of fusion of water is 3.35 105 J/kg. What is the mass of water in the cup, if the final temperature is - 20.0°C?
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Romeo Santos
Which part of a stream's sediment load moves the slowest?
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Jerry Winters
Jim (mass=100kg) rollerblades on a smooth horizontal floor at a constant speed of 2.0 m/s for a distance of 5m in 5 seconds. What is the power in this process? (assume g is 10 m/s^2)
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Sincere Daniel
B1. A stone is dropped from the cliff. If the height of the cliff is 200cm.

(a) calculate

(1)

Potential energy after falling for 20 seconds
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Ella
Which statement most describes how the amplitude and energy of a sound wave

are affected as the wave travels through air and as the wave travels through a

brick wall?

The sound wave has less energy and a larger amplitude when traveling through a

brick wall than when traveling through air.

The sound wave has more energy and a smaller amplitude when traveling

through a brick wall than when traveling through air.

The sound wave has more energy and a larger amplitude when traveling through

a brick wall than when traveling through air.

The sound wave has less energy and a smaller amplitude when traveling through

a brick wall than when traveling through air.
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Jean Thompson
Why do you think that some asteroids tumble end over end through space while other asteroids rotate around their axis?
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