Grade 11Mechanics

a meter stick of mass 400g is pivoted at one end displaced through an angle of 60 degree .then what amount of potential energy increases

nisha

9 Years agoGrade 11

2 Answers

Vikas TU

9 Years ago

Initial P.E = mgl/2 = > 0.4*10*1/2 = 2 Joules.

At 60 degree angle ,

P.E. = mgl(1-cos60)/2 = > 0.4*10*1(1-0.5)/2 => 1 Joules.

Hence the potential energy get decreased by = 2 – 1 = 1 Joue instead of increasing.

ankit singh

5 Years ago

Here

Mass of stick ,m=0.4 kg

Length of stick , l=1m

Initial Potential energy =2mgl=20.4×10×1=2 J

At 600 angle ,

Final Potential energy =2mgl(1−cos600)=20.4×10×1(1−0.5)=1 J.

So , Its potential energy decreased by 2−1=1 J

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a meter stick of mass 400g is pivoted at one end displaced through an angle of 60 degree .then what amount of potential energy increases

nisha

2 Answers

Vikas TU

ankit singh

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