45 N 34 N A 4.0-kg block slides down a 39 degree incline at a constant speed whe

Question

45 N 34 N A 4.0-kg block slides down a 39 degree incline at a constant speed when a 16-N force is applied acting up and parallel to the incline What is the coefficient of kinetic friction between the block and the surface of the incline? 0.76 0.59 0.33 0.28 0.25 A 60 kg person rides down an icy hill of 19 degree slope while standing on a 2.6-kg flat-bottomed bathroom scale. Assume there is no frictional force between the bottom of the scale and the hill. The static friction force the scale exerts on the person is___. 0 N 556 N 200 N 580 N 191 N A 44-kg child rides on a circus Ferris wheel that takes her around a vertical circular path with a radius of 25 m every 26 s. What is the magnitude of the resultant force on the child at the highest point on this trajectory?

Explanation / Answer

5) d) 0.28

Apply, net force acting on the block = 0

16 - m*g*sin(39) + N*mue_k = 0

16 - m*gsin(39) + m*g*cos(39)*mue_k = 0

16 - 4*9.8*sin(39) + 4*9.8*cos(39)*mue_k = 0

mue_k = (4*9.8*sin(39) - 16)/(4*9.8*cos(39) )

= 0.28

6) a) 0 N

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