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Question :
71. A trapeze artist, with swing, weighs 800 N; he : 2102094

71. A trapeze artist, with swing, weighs 800 N; he is being held to one side by his partner so that the swing ropes make an angle of 30.0? with the vertical. In such a condition of static equilibrium, what is the tension in the rope?

A. 924 N

B. 400 N

C. 196 N

D. 461 N

72. A 200-N crate rests on an ramp; the maximum angle just before it slips is 25? with the horizontal. What is the coefficient of static friction between crate and ramp surfaces?

A. 0.11

B. 0.21

C. 0.38

D. 0.47

73. A 150-N sled is pulled up a 28? slope at a constant speed by a force of 100 N. What is the coefficient of kinetic friction between sled and slope?

A. 0.53

B. 0.22

C. 0.13

D. 0.33

74. Jamal pulls a 150-N sled up a 28.0? slope at constant speed by a force of 100 N. Near the top of the hill he releases the sled. With what acceleration does the sled go down the hill?

A. 1.20 m/s^{2}

B. 1.67 m/s^{2}

C. 2.22 m/s^{2}

D. 2.67 m/s^{2}

75. Dana uses a rope to pull a box that weighs 300 N across a level surface with constant velocity. The rope makes an angle of 30? above the horizontal and the tension in the rope is 100 N. What is the coefficient of friction?

A. 0.35

B. 0.29

C. 0.17

D. 0.20