InterviewSolution
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InterviewSolution
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The figure show a simple pendulum consisting a bob of mass 100 g. Initially the bob of the pendulum is at rest at O. It is displaced to one side at A. The height of A above O is 5 cm. (i) What is the value of potential energy of the bob at A? (ii) What is the value of kinetic energy of the bob at position P, whose height above O is 2 cm? (Take g=10ms^(-2)) |
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Answer» `g=10ms^(-2)` `E_(P)` at the POINT `A=mgh` `=0.1xx10xx0.05J` `=0.05J` (ii) `E_(K)=(1)/(2)MV^(2)`. As the bob swings FREELY. `v^(2)=2as=2gh` `therefore E_(k)=(1)/(2)m(2gh)=mgh` `=0.1xx10xx0.02J [because h=2cm=0.02m)` `=0.02J` |
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