Speed of bowling ball involving speed of sound

  • Thread starter Entr0py
  • Start date
  • #1
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Homework Statement


A bowling ball traveling with a constant speed hits the pins at the end of a bowling lane 16.5 m long. The bowler hears the sound of the ball hitting pins 2.5 s after ball is released from his hands. What is the speed of ball, assuming speed of sound is 340 m/s?

Homework Equations


the kinematic equations
x=x0+v0t+.5at^2
v=v0+at
vf^2=v0^2+2ax

The Attempt at a Solution


Well, I thought that somehow I could use the time it takes for the sound wave to travel up and down the bowling lane, which is (33 m)/(340 m/s)= about .097 s. See I can picture the problem in my head, but I don't know how to get t for the ball in order to find the speed.
 

Answers and Replies

  • #2
Nidum
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Hint : start by working out the time taken for sound to travel one direction back from pins to bowler .
 
  • #3
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Hint : start by working out the time taken for sound to travel one direction back from pins to bowler .
Are you asking the time it takes sound to travel just to end of lane?
 
  • #4
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Are you asking the time it takes sound to travel just to end of lane?
Then wouldn't the time be about .049 s to travel from the pins to you?
 
  • #5
Nidum
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So how long does ball take to travel from bowler to pins ?
 
  • #6
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Hint : start by working out the time taken for sound to travel one direction back from pins to bowler .
Now, since I hear the ball hitting the pins 2.5 s after I throw it, then the time it takes the ball to hit the pins= 2.5 s - .049 s =2.45 s. Now to find velocity I do v= change in r/change in t= 16.5 m/2.45 s= 6.73 m/s is speed of ball.
 
  • #7
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So how long does ball take to travel from bowler to pins ?
.049 s.
 
  • #8
Nidum
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Your answer of 2,45 sec travel time and 6,73 M/sec velocity is correct .
 

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