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The motor of an engine is rotating about its axis with an angular velocity of 100rpm. It comes to rest in 15s , after being switched off. Assuming constant angular deceleration, calculate the no. of revolutions made by it before coming to rest.

The motor of an engine is rotating about its axis with an angular velocity of 100rpm. It comes to rest in 15s , after being switched off. Assuming constant angular deceleration, calculate the no. of revolutions made by it before coming to rest.

Grade:11

1 Answers

srinivasa rao mekapothula
25 Points
9 years ago

find  ∞ , angular acceration by, w 2  - w 1 = ∞ t ,alpha comes out to be , - 2∏ /9  rad/sec 2.

 

find total angular distance  s = ut + 1/2  a t 2  , 

no.of  rotations   =   s /  2∏     =   12.5

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