### The valuable coefficient of kinetic friction

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##### Reference no: EM134375

Question1

A 350 piano slides 3.4 down a 34 incline and is kept from accelerating by a man who is pushing back on it parallel to the incline .The valuable coefficient of kinetic friction is 0.37.

Question2

A motorist travelling at 16 m/s encounters a deer in the road 44 m ahead. If the greatest acceleration the vehicle's brakes are capable of is -6 m/s2, what is the most reaction time of the motorist that will allow her or him to avoid hitting the deer?

Question3

A computer hard disk starts from rest then speeds up with the angular acceleration of 190 rad/s^2 until it reaches its final angular speed of 7200 rpm . How many revolutions has disk made in 10 seconds after it starts up?

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