A girl of Weight W , is sitting on an electric swing rotating in a vertical plane. She feels her weight to have increased by 25 % as the swing goes up .WhaT weight she would experience when swing comes down? please answer with diagram of swing also

Asked by shekharsharma | 13th Sep, 2010, 11:09: AM

Expert Answer:

where F = centipetal force
--------------------------------------
Assuming angular speed of swing is constant
When she is at point A
F + W = W + W/4
=>
 F = W/4
Now when she is at B
 Direction of F is opposite to W 
therefore net downward force= W-F
                                        = W-W/4
                                        = 3W/4  -> weight felt by her.

Answered by  | 13th Sep, 2010, 07:05: PM

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