Can anybody solve this question for me? Questions (16 -18 ) refer to the followi

Question

Can anybody solve this question for me? Questions (16 -18 ) refer to the following situation: A particle move on a circle of radius 2m,while being acted upon by a constant horizontal force of magnitude 5N, as Shown in Figure A below 16. In Figure A. if the particle moves from A to C, the work done by F equals 17. in figure A, if particle moves form B to D , the work done by F equals 18. In Figure A, If the particle starts at A, complete 2 revelations around the circle, then coordinates to B, then the work done by F equals 19. Conservative forces conserve a system?s 20. Let vector A and Vector B be two vectors with magnitudes A and B, respectively. Which of the following must be true?

Explanation / Answer

so W = F d cos theta

so only distance parallel to F matters

so W = 5*-4 = -20 J

so b)

17) B to D no net distance parllel to F so W = 0

so
a)

18) so only overall distance matters since force is constant

so B to A d = 2 m

soW = 5*2 = 10 J so c)

19) conservative forces conserve total energy

so c)

20) A*B = A B cos theta

so A*B <= AB

so c)

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