When an object under the influence of conservative forces, the sum of its kineti

Question

When an object under the influence of conservative forces, the sum of its kinetic and ' When an object is potential energies can change. 10 Identical twins named Bill and Phil both push against a stationary wall. Bill stops after (10 minutes, while Phil is able to push for 5.0 minutes longer before he gets tired. Compare the work they do. Both twins do positive work, but Bill does 50% more work than Phil. Both twins do positive work, but Phil does 75% more work than Bill. Both twins do positive work, but Phil does 25% more work than Bill. Both twins do positive work, but Phil does 50% more work than Bill v ta Neither of them does any work. 11. In order to lift a weight at constant velocity, you must pull up harder on the weight than it pulls down on you.

Explanation / Answer

9. False (Net work done is zero, potential and kinetic energy changes)

10. D. since no work is done. ( 0 displacement in the direction of force)

11. False

12. T*cos(theta) = m*a

T=m*a/cos(theta)

T>ma

13. -L +W <F hence L+F >W

14. W = F*d = (12,10)* (16,11) = 12*16 + 10*11 =302 J

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