aloh of 1 m/s A horizontal shove of at least 200-N is required to start moving a

Question

aloh of 1 m/s A horizontal shove of at least 200-N is required to start moving a 800-N crate initially at rest on a horizontal floor. The coefficient of static friction is: A) 0.25 B) 0.125 C) 0.50 D) 4.00 15. 16. A feather and a lead ball are dropped from rest in vacuum on the Moon. The acceleration of the feather is: A) more than that of the lead ball B) the same as that of the lead ball C) less than that of the lead ball D) 9.8 m/s 17. The standard 1-kg mass is attached to a compressed spring and the spring is released. I the mass initially has an acceleration of 5.6 m/s, the force of the spring has a magnitude of A) 2.8 N B) 5.6 N C) 11.2 N D) ON A crane operator lowers a 16,000 N steel ball with a downward acceleration of 3 m/s. The tension in the cable is: A) 4900 N B) 11,000N C) 16,000 N D) 21,000 N 18. A bureau rests on a rough horizontal surface(,-0.50, ,-0.40). A constant horizontal force, just sufficient to start the bureau in motion, is then applied. The acceleration of the bureau is: A) 0 B) 0.98 m/s2 C) 3.3 m/s2 D) 4.5 m/s2 19, A stone is released from a balloon that is descending at a constant speed of 10 m/s. Neglecting air resistance, after 20 s the speed of the stone is: A) 2160 m/s B) 1760 m/s C) 206 m/s D) 196 m/s 20.

Explanation / Answer

here,

15)

horizontal force , F = 200 N

weight , W = 800 N

let the coefficient of friction be us

F = us * W

200 = us * 800

us = 0.25

the coefficient of friction is A) 0.25

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