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questions about Work, Force, Distance, PE, KE, velocity...

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Physical science (8th edition) by Bill W. Tillery

Parallel Exercises

1. How much work is done when a force of 800.0 Ni s exerted while pushing a crate across a level floor for a distance of 1.5m?

2. A force of 400.0 N is exerted on a 1,250 N car while moving it a distance of 3.0 m. How much work was done on the car?

4. An electric hoist does 196,000 J of work in raising a 250. 0 kg load. How high was the load lifted?

8. How much work will be done by a 30-gram bullet that is traveling at 200m/s?

9. A force of 50.0 lb is used to push a box 10.0 ft across a level floor. (a) How much work was done on the box? (b)What is the change of potential energy as a result of this move?

12. (a) What is the kinetic energy of a 1,500.0 kg car with a velocity of 72.0 km/h? (b) How much work must be done on this car to bring it to a complete stop?

15. A 175.0 lb hiker is able to ascend a 1,980 ft high slope in 1 hour and 45 minutes (a) How much work did the hiker do? (b) What was the average power output in hp?

16. (a) How many seconds will it take a 10.0 hp motor to lift a 2,000.0 lb elevator a distance of 20.0 ft (b) What was the average velocity of the elevator?

18. What is the velocity of a 60.0 kg jogger with a kinetic energy of 1,080.0 J?

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Solution Summary

Many questions are solved in this posting. These questions involved cover work, force, distance, potential energy, kinetic energy, velocity, power, time, and height.

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A 3.0 kg object subject to a restoring force F...

2. A 3.0 kg object subject to a restoring force F is undergoing simple harmonic motion with small amplitude.

(See attachment)

The potential energy U of the object as a function of distance x from its equilibrium position is shown above.
This particular object has a total energy E of 0.4 J.

(a) What is the object's potential energy when its displacement is +4cm from its equilibrium position?

(b) What is the farthest the object moves along the x-axis in the positive direction? Explain your reasoning.

(c) Determine the object's kinetic energy when its displacement is -7 cm.

(d) What is the object's speed at x = 0?

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