
College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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A man weighing 750N climbs a flight of stairs which is 5 meters high. How much work does he do?
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- A 10 kg barbell is rolling down a hill. There is no friction or air resistance acting on it, only the force of gravity. If it starts out moving 2 ms1, and ends up moving 7 ms1, then how much work does gravity do on it?arrow_forwarda rope applies a hortizontal force of 180 N to pull a crate a distance of 2 m across a floor. A frictional force of 120 N opposes this motion. What is the total work done on the crate?arrow_forwardA man picks up a 50 kilogram block and carries it up a flight of stairs 10 meters high. He then carries the block back down the stairs and places the block in its original position. What is the NET work done on the block?arrow_forward
- A child pulls a sled upon snow covered hill. The child does 450 J of work on the sled. If child walks 12 m up the hill , how large a force must child exert ?arrow_forwardA mother pulls her child on a sled across a rough patch of snow. The sled and child have a combined mass of 25kg. The sled’s tow rope is at 42° angle above the horizontal and the mother exerts a force of 65N. How much work has the mother done on the sled if she moves it 15m forward?arrow_forward
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