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help me in pendulum


Jay Sharma
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i m not able to solve this problem so can someone help me please

Q)A pendulum of length 2 m left at A When it reaches B,it loses 10% of its total energy due to air resistance. The velocity at B is:

A)6 m/s

B)1 m/s

C)2 m/s

D)8 m/s

please help me

Thnx in advance


please reply fast

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It is quite a vague question, however...

 

Use the clues given in the question. For instance, it's asking for 'total energy', so potential energy and something else.

 

(Maybe obvious) Hint: The balancing term needs to include velocity.

Edited by Royston
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It is quite a vague question, however...

 

Use the clues given in the question. For instance, it's asking for 'total energy', so potential energy and something else.

 

(Maybe obvious) Hint: The balancing term needs to include velocity.

potential energy and?????????

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What is g ?

 

Again, what equations do you think would answer the question.

 

How can you manipulate those equations to arrive at an answer ?

 

I don't think you need to worry about angles....and I don't think the question assumes you're on the moon ;).

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