Pendulum question

  • Thread starter ashvuck101
  • Start date
  • #1
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Homework Statement



A simple pendulum, 2.0 m in length, is released from rest when the support string is
at an angle of 25° from the vertical. What is the speed of the suspended mass at the
bottom of the swing?

Homework Equations



R2= X2 + Y2

The Attempt at a Solution



I know the answer is 1.9ms-1

but i keep getting 1.8126ms-1

which is 2.cos(25)
what am i doing wrong?
 

Answers and Replies

  • #2
648
2
If you are going to use conservation of energy, for example, then you equate the k.e. at the lowest point to the p.e. at the highest.
The mass has risen a vertical height 2 - 2.cos25. when moved to its starting point.
 

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