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College Physics
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ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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How much power would be required to hoist a 48 kg couch up to a 26 m high balcony in 5.0 seconds? Assume it starts and ends at rest. |
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- A man pushes a lawn mower on a level lawn with a force of 211 N. If 52% of this force is directed forward, and 53 W of power is expended in pushing the mower 7.0 m, how much time is spent in pushing the mower this distance?arrow_forwardA daredevil on a motorcycle leaves the end of a ramp with a speed of 29.0 m/s as in the figure below. If his speed is 27.3 m/s when he reaches the peak of the path, what is the maximum height that he reaches? Ignore friction and air resistance.arrow_forwardA 145 kg crate slides down a ramp, starting from rest. The ramp is inclined at an angle of 20.6 degrees with respect to the horizontal and has a height of 1.74 m. The crate is placed on frictionless casters so that it slides down the ramp without friction. What is the final speed of the crate (in m/s) just as it reaches the bottom of the ramp? Use g = 9.81 m/s?.arrow_forward
- While driving, you notice that your 1150 kg car slows down from 70 mph to 45 mph in about 4.85 s when it is in neutral. How much horsepower is needed to keep the car moving at a constant velocity?arrow_forwardA Ford F-150 pickup truck has a mass of 1950 kg. One truck is equipped with an Ecoboost 2.7 liter V6 engine that produces a useful power output of 242 kW. (a) How long in seconds does it take the truck to start from rest and reach a speed of 12.5 m/s, assuming no friction effects and it is traveling on a level road? (b) How long will it take to reach the speed of 12.5 m/s from rest, if the truck also climbs a hill that has a height of 2.75 m?arrow_forwardA rocket is attached to the back of a train engine which pushes the engine along a curvy track with an applied force of 1,000 Newtons. The engine has a mass of 500 kg. The total length of track is 800 meters. Starting from rest, what will be the train's speed at the end of the track? (You must use energy methods for credit on this problem not kinematics.)arrow_forward
- If it took 40 J of energy to push a crate 4 m across the floor, how much force was being applied to the crate? Your answer should be in units of N but you should only submit the number for your answer.arrow_forwardAn object with mass ? = 1.6 kg is released from rest at a height ℎ = 8 m from the top ofan inclined plane. It slides down the inclined plane without friction then slides across arough surface with a coefficient of kinetic friction ?? = 0.4. What is the speed of the object after it slides 4.2meters across the rough surface?arrow_forward
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