Help for answers 13,14 & 15 30° he. FIEA Approved label, a soccer ball must boun
ID: 1579596 • Letter: H
Question
Help for answers 13,14 & 15 30° he. FIEA Approved label, a soccer ball must bounce at least 135 cm high and no more FIFA em high when dropped from a height of 200 cm onto a steel plate. 2 To earn What is the minimum coefficient of restitution of a FIFA Approved soccer ball? What is the maximum coefficient of restitution of a FIFA Approved soccer ball? warm hockey puck has a coefficient of restitution of 0.50, while a frozen hockey puck has ent of restitution of only 0.35. In the NHL, the pucks to be used in games are kept During a game, the referee retrieves a puck from the cooler to restart play but is told by manager that several warm pucks were just put into the cooler. To check to make frozen the equipment sure he has a game-ready puck, the referee drops the puck on its side from a height of 2 m. How high should the puck bounce if it is a frozen puck? 4 A 0.15 kg baseball collides with a 1.0 kg bat. The ball has a velocity of 40 m/s immediately before the collision. The center of mass of the bat also has a velocity of 40 m/s, but in the oppo- site direction, just before the collision. The coefficient of restitution between the bat and the ball is 0.50. Estimate how fast the baseball is moving as it leaves the bat following the collision.Explanation / Answer
12)Given,
h0 = 200 cm ; h(min) = 135 cm ; h(max) = 155 cm
from conservation of energy
m g h0 = 1/2 m u^2
u^2 = 2 g h0
after impact
v^2 = 2 g h'
dividing v^2/u^2
v^2/u^2 = h'/h0
we know that,
v = e u ; where e is the resistution coefficient
e^2 = h'/h
e = sqrt (h'/h)
for e min, h' = h(min) = 135 cm
e = sqrt (135/200) = 0.822
for e max, h' = h(max) = 155 cm
e = sqrt (155/200) = 0.880
Hence, e(min) = 0.822 and e(max) = 0.880
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