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Question :
76. Hector drives a pickup truck horizontally at 15.0 m/s. : 2102095

76. Hector drives a pickup truck horizontally at 15.0 m/s. He is transporting a crate of delicate lead crystal. If the coefficient of static friction between the crate and the truck bed is 0.400, what is the minimum stopping distance for the truck so the crate will not slide?

A. 28.7 m

B. 51.0 m

C. 33.6 m

D. 44.4 m

77. The coefficient of friction between a racecar's wheels and the track is 1.0. The car starts from rest and accelerates at a constant rate for 400 m. Find the maximum speed at the end of the race.

A. 44 m/s

B. 66 m/s

C. 89 m/s

D. 99 m/s

78. A worker pulls a 200-N packing crate at constant velocity across a rough floor by exerting a force *F* = 55.0 N at an angle of 35.0? above the horizontal. What is the coefficient of kinetic friction of the floor?

A. 0.133

B. 0.267

C. 0.400

D. 0.200

79. A hockey puck moving at 7.0 m/s coasts to a halt in 75 m on a smooth ice surface. What is the coefficient of friction between the ice and the puck?

A. *m* = 0.025

B. *m* = 0.033

C. *m* = 0.12

D. *m* = 0.25

80. An Olympic skier moving at 20.0 m/s down a 30.0? slope encounters a region of wet snow, of coefficient of friction *m** _{k}* = 0.740. How far down the slope does she go before stopping?

A. 119 m

B. 145 m

C. 170 m

D. 199 m