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  31. A simple pendulum, 1.00 m in length, released from

Question :   31. A simple pendulum, 1.00 m in length, released from : 2102121

 

31. A simple pendulum, 1.00 m in length, is released from rest when the support string is at an angle of 35.0? from the vertical. What is the speed of the suspended mass at the bottom of the swing? (g = 9.80 m/s2 and ignore air resistance)

A. 0.67 m/s

B. 0.94 m/s

C. 1.33 m/s

D. 1.88 m/s

32. A simple pendulum, 2.0 m in length, is released with a push when the support string is at an angle of 25? from the vertical. If the initial speed of the suspended mass is 1.2 m/s when at the release point, what is its speed at the bottom of the swing? (g = 9.8 m/s2)

A. 2.3 m/s

B. 2.6 m/s

C. 2.0 m/s

D. 0.5 m/s

33. A simple pendulum, 2.0 m in length, is released by a push when the support string is at an angle of 25? from the vertical. If the initial speed of the suspended mass is 1.2 m/s when at the release point, to what maximum angle will it move in the second half of its swing?

A. 37?

B. 30?

C. 27?

D. 21?

34. A hill is 100 m long and makes an angle of 12? with the horizontal. As a 50-kg jogger runs up the hill, how much work does gravity do on the jogger?

A. 49 000 J

B. 10 000 J

C. -10 000 J

D. zero

35. A 2.00-kg ball has zero kinetic and potential energy. Ernie drops the ball into a 10.0-m-deep well. Just before the ball hits the bottom, the sum of its kinetic and potential energy is:

A. zero.

B. 196 J.

C. -196 J.

D. 392 J.

 

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