Solving for the velocity of a Pendulum

  • #1
momoneedsphysicshelp
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Homework Statement:
A 2 kg pendulum is raised to an angle of 53 degrees relative to the vertical, as shown below, and released from rest. What is the speed of the mass at the bottom of its swing?
Relevant Equations:
6.2 m/s
60 m/s
10 m/s
7.7 m/s
40 m/s
I think the answer is 6.2 but I also got 40m/s. Which one is right?
 

Answers and Replies

  • #2
haruspex
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Homework Statement:: A 2 kg pendulum is raised to an angle of 53 degrees relative to the vertical, as shown below, and released from rest. What is the speed of the mass at the bottom of its swing?
Relevant Equations:: 6.2 m/s
60 m/s
10 m/s
7.7 m/s
40 m/s

I think the answer is 6.2 but I also got 40m/s. Which one is right?
Depends on the length of the pendulum.
Please post your working.
 
Last edited:
  • #3
kuruman
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Also, please post the picture that is supposed to be "shown below". Maybe it shows the initial height above the lowest point of the swing. If it's 2 m (as I suspect), the correct answer for the speed is (a). Answer (e) is included to catch those who forget to take the appropriate square root. Answers may vary slightly depending on what number you use for the acceleration of gravity.
 
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