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A 0.145-kg baseball pitched at 39.0 m/s is hit on a
Chapter 1, Problem 3P(choose chapter or problem)
Problem 3P
A 0.145-kg baseball pitched at 39.0 m/s is hit on a horizontal line drive straight back toward the pitcher at 52.0 m/s. If the contact time between bat and ball is 3.00 × 10−3 s, calculate the average force between the ball and bat during contact
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Questions & Answers
QUESTION:
Problem 3P
A 0.145-kg baseball pitched at 39.0 m/s is hit on a horizontal line drive straight back toward the pitcher at 52.0 m/s. If the contact time between bat and ball is 3.00 × 10−3 s, calculate the average force between the ball and bat during contact
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ANSWER:Step 1 of 2
We know that, ……(1)
Number of revolutions can be calculated from angular displacement
Initial angular velocity,
Final angular velocity,
(since 1 min = 60 s)
Now, 1 revolution = rad
So, 50 revolutions = 50
rad
50 revolutions = rad
Therefore, rad/s
Given that, time = 2.0 s
Therefore, the crankshaft’s angular acceleration (from equation (1))
…..(2)