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 b.in ym, vh evy() 6qne;+hn4ptecome dangerous project7v,7q +v82 ;sk:dkr ij3jhkgyuk fte2iles as they melt. Consi,hv7 :g2vjk i +tfd;q7kr8u32je ykksder a chunk of snow at the ridge of a roof with 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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