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1. It is the equal amount of work. 50 x 2 is equal to 25 x 4.

2. The work on the object is 40 meters (multiply 20 by 2)

3. The efficiency is 66.6%

4. The Potential Energy is 680 joules. To get the answer simply multiply 40 by 17.

5. The Kinetic Energy is 45,900 joules.

6. No, because the problem involves an independent system (you and your brother), not a external system (the airplane).

7. The road is pushing back 500 Newtons (due to Newton's Third Law).

8. The corresponding reaction force is the force between you and the Earth.

9. The Mechanical Advantage is .25.

10. The Ideal Mechanical Advantage equals 2.

This Page was last edited on Thursday, July 27, 2000 .