Sorry, I had to put 3 questions in this one :) A hockey puck is given an initial

Question

Sorry, I had to put 3 questions in this one :) A hockey puck is given an initial velocity of 38.4 m/s along the ice. Find the speed of the puck1.04 s later if the coefficient of kineticfriction between puck and ice is 0.546.(HINT: The result is independent of the mass of the puck.)
1 m/s
A 0.092 kg rock is attached to a2.06 m long string and swung in ahorizontal circle at a speed of 30.6 m/s.Find the tension in the string. Neglect the effect of gravity.
1 N A 1160-kilogram car, moving with aspeed of 15.0 m/s, is on a flat, circular curve having a radius of56.8 meters.
How much friction is needed to keep the car on the road?1 N

What is the coefficient of friction between the tires and the road?2

Sorry, I had to put 3 questions in this one :) A hockey puck is given an initial velocity of 38.4 m/s along the ice. Find the speed of the puck1.04 s later if the coefficient of kineticfriction between puck and ice is 0.546.(HINT: The result is independent of the mass of the puck.)
1 m/s
A 0.092 kg rock is attached to a2.06 m long string and swung in ahorizontal circle at a speed of 30.6 m/s.Find the tension in the string. Neglect the effect of gravity.
1 N A 1160-kilogram car, moving with aspeed of 15.0 m/s, is on a flat, circular curve having a radius of56.8 meters.
How much friction is needed to keep the car on the road?1 N

What is the coefficient of friction between the tires and the road?2


How much friction is needed to keep the car on the road?1 N

What is the coefficient of friction between the tires and the road?2

Explanation / Answer

Hockey puck:    acceleration = ug =0.546 * 9.80 = 5.3508 .    change in speed = acc * time = 5.3508* 1.04 = 5.565 m/s . The puck slows down by   5.565 m/s so   final speed = 38.4 - 5.565 =    32.8 m/s .

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