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Question :
36. As I slide a box at constant speed up : 2102105

36. As I slide a box at constant speed up a frictionless slope, pulling parallel to the slope, the tension in the rope will be:

A. greater than the tension would be if the box were stationary.

B. greater than the weight of the box.

C. equal to the weight of the box.

D. less than the weight of the box.

37. A boxcar of mass 200 tons at rest becomes uncoupled on a 2.5? grade. If the track is considered to be frictionless, what speed does the boxcar have after 10 seconds?

A. 0.37 m/s

B. 0.59 m/s

C. 1.3 m/s

D. 4.3 m/s

38. As a 3.0-kg bucket is being lowered into a 10-m-deep well, starting from the top, the tension in the rope is 9.8 N. The acceleration of the bucket will be:

A. 6.5 m/s^{2} downward.

B. 9.8 m/s^{2} downward.

C. zero.

D. 3.3 m/s^{2 }upward.

39. A 5 000-N weight is held suspended in equilibrium by two cables. Cable 1 applies a horizontal force to the right of the object and has a tension, *T*_{1}. Cable 2 applies a force upward and to the left at an angle of 37.0? to the negative *x*-axis and has a tension, *T*_{2}. What is the tension, *T*_{1}?

A. 4 000 N

B. 6 640 N

C. 8 310 N

D. 3 340 N

40. A 5 000-N weight is suspended in equilibrium by two cables. Cable 1 applies a horizontal force to the right of the object and has a tension, *T*_{1}. Cable 2 applies a force upward and to the left at an angle of 37.0? to the negative *x*-axis and has a tension, *T*_{2}. Find *T*_{2.}

A. 4 000 N

B. 6 640 N

C. 8 310 N

D. 3 340 N