College Physics
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ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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Transcribed Image Text:1. A weightlifter lifts a 200 N barbell from the floor to a height of 2 m. How much work is
done?
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- 5. A 60.0-kg woman climbs a staircase to a level 11.0 m above her starting point in 66.0 s. (a) How much force does she exert in raising herself from step to step? (b) How much work does she do in getting to the higher level? (c) What is her power?arrow_forward2. A cart with a mass of 100 kg is filled with 1,800 kg of coal. A force of 14 kN is used to pull the cart up a 23° incline that is 10.5 m long. The coefficient of kinetic friction between the cart and the incline is 0.300. The cart is initially at rest at the bottom of the incline. (a) Find the work done by each of these forces: the force pulling the cart up the incline, gravity, friction, : and the normal force. (b) What is the net work done on the cart? (c) What is the cart's velocity at the top of the incline?arrow_forward2. a) How much work do you do if you carry a 100 N backpack up a flight of stairs with a height of 5 m? (b) How much work was done by gravity?arrow_forward
- 2. A cart is pulled a distance D on a flat, horizontal surface by a constant force F that actsat an angle θ with the horizontal direction. The other forces on the object during thistime are gravity (Fw), normal forces (FN1) and (FN2), and rolling frictions Fr1 and Fr2,as shown below. What is the work done by each force?arrow_forwardTHANK YOUarrow_forward1. A box with a mass of 3.0 kg is accelerated from rest by a constant force across a floor at a rate of 1.7 m/s for 6.5 s. (a) How much work does the force do on the box? (b) How much power is produced by the force in moving the box?arrow_forward
- 11. How much work does Amanda's car experience compared to Bertha's? Amanda and Bertha are in a car race. Their cars have the same mass. At one point in the race, they both change their speeds by 10 m/s in 2 seconds. Ignore air friction. 2s later 2s later 10 m/s 20 m/s 20 m/s 30 m/s Amanda Bertha a. Amanda's car experiences less work b. Amanda's and Bertha's car experience the same amount of work c. Amanda's car experiences more work. O d. Only Rihanna would know. (Work Work Work Work Work...) 96 altarrow_forward5. A person pulls an object of mass 40 kg as far as 20 m above a flat floor at a constant speed. The force used is directed 370 upwards horizontally. The coefficient of kinetic friction of the object with the floor is 0.20. Determine the work by the person, the work by the frictional force, and the total work on the object.arrow_forwardReference: Horsepower Lab. John, of mass 82.4 kg, can do work for about 2.0 minutes at the rate of 1.0 hp. How long will it take him to climb three flights of stairs, a vertical height of 12.0 m? 1hp = 1 horsepower.arrow_forward
- 1. A jeep with mass of 2000 kg is going 18 m/s at the bottom of a hill that is 50.0m high. When it reaches the top, it is travelling at 10m/s. (a) what is the total work done by all forces (the jeep engine, the mud, gravity, etc) as it ascends the hill? (b) What is the minimum work required by engine of the jeep if only the engine and gravity are doing work (if there is na friction, forces from mud, etc)?arrow_forward1. You push a 67 kg box across a floor where the coefficient of kinetic friction is uk = 0.55. The force you exert is horizontal.(a) How much power is needed to push the box at a speed of 0.50 m/s?(b) How much work do you do if you push the box for 35s? Explain and draws.arrow_forward6. A force and a displacement are given in component form. What is the work done by this force? F =(si+2j+k)N Ar=(2i-3 +2%)m 24 )marrow_forward
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