gc physics textbook chapter 4 problems (id: 253ed720e)

本题目来源于试卷: gc physics textbook chapter 4 problems，类别为 通用国际物理

[填空题]
Piles of snow on slippery roofs can o,x3lha 9tk09egl 7g o)wo5nq become davxurcr3 vq.y+ 019p(7 3 vj)-gsexpb7 gjachtngerous projectiles as they melt. Consider a chunk of snow at the ridge of a roof w3vx . p qhc+y1- art)0gr7pjec3vb(sj97vug x ith a pitch of $ 30^{\circ}$ .
(a) What is the minimum value of the coefficient of static friction that will keep the snow from sliding down?   
(b) As the snow begins to melt, the coefficient of static friction decreases and the snow eventually slips. Assuming that the distance from the chunk to the edge of the roof is 5.0 m and the coefficient of kinetic friction is 0.20 , calculate the speed of the snow chunk when it slides off the roof.   
(c) If the edge of the roof is 10.0 m above ground, what is the speed of the snow when it hits the ground?   

参考答案:
空格1: 0.58±2%  空格2: 5.7±2%  空格3: 15±2% 


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