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  66. A 10.0-kg mass placed a 25.0? incline and friction

Question :   66. A 10.0-kg mass placed a 25.0? incline and friction : 2102093

 

66. A 10.0-kg mass is placed on a 25.0? incline and friction keeps it from sliding. The coefficient of static friction in this case is 0.580, and the coefficient of sliding friction is 0.520. What is the frictional force in this situation?

A. 41.4 N

B. 88.8 N

C. 46.2 N

D. 51.5 N

67. A 10.0-kg mass is placed on a 25.0? incline and friction keeps it from sliding. The coefficient of static friction in this case is 0.580, and the coefficient of sliding friction is 0.520. The mass is given a shove causing it to slide down the incline. What is the frictional force while the mass is sliding?

A. 41.4 N

B. 88.8 N

C. 46.2 N

D. 51.5 N

68. A 10.0-kg mass is placed on a 25.0? incline and friction keeps it from sliding. The coefficient of static friction in this case is 0.580 and the coefficient of sliding friction is 0.520. The mass is given a shove causing it to slide down the incline. Taking down the incline as positive, what is the acceleration of the mass while it is sliding?

A. 0.477 m/s2

B. -0.477 m/s2

C. 1.99 m/s2

D. -1.99 m/s2

69. A man pulls a sled at a constant velocity across a horizontal snow surface. If a force of 80 N is being applied to the sled rope at an angle of 53? to the ground, what is the force of friction between sled and snow?

A. 80 N

B. 64 N

C. 48 N

D. 40 N

70. A trapeze artist, with swing, weighs 800 N; he is momentarily 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 horizontal force being applied by the partner?

A. 924 N

B. 400 N

C. 196 N

D. 462 N

 

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