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Review Chapter 10
Problems
1. A 70.0 kg person carries a 25 N package up a flight of stairs. The vertical height of the stairs is 12.0 m. How much work is done?
2. A force of 1600 N is needed to keep a piano from sliding down a 10.0 m ramp. How much work is done?
3. A child pulls a sled through the snow with a force of 75 N applied to the rope at an angle of 30.0o with the horizontal.
a. How much work is done if they moved 15 m?
b. How much work would have been done if the rope had been pulled horizontally with the same force?
4. It takes 7500 J of work to slide a crate a distance of 15 m across a floor. A force of 850 N was applied to the rope. What angle did the rope make with the ground?
5. It took a force of 250 N to pull a crate weighing 765 N across the floor. The work done was 4500 J. How far was the crate moved?
6. A student with a mass of 85.0 kg runs up three flights of stairs in 12.5 s. The student has gone a vertical distance of 8.0 m. What is the student’s power?
7. A 8.0 kW motor lifts a 3500. kg elevator to a height of 10.5 m. How long does it take?
8. A force of 1250 N is used to push a piano up a ramp 24 m long to a height of 3.0 m above the ground. The piano weighs 7500 N.
a. What is the work input?
b. What is the work output?
c. Find the mechanical advantage.
d. Find the ideal mechanical advantage.
e. What is the efficiency of the plane?
9. A 5.0 x 10 2 N load is lifted 6.0 m with a pulley. The force exerted on the pulley rope is 165 N and the efficiency is 7 5%. How far is the pulled?
Chapter 10
Review