First slide
Work
Question

A simple pendulum  of length 1m having bob of mass 100g is displaced through 60 from equilibrium position. The work done by gravity is  (g=10ms2)

Moderate
Solution

h=llcosθh=l(1cosθ)W=mghcos180W=mgl(1cosθ)W=0.1×10×1112=0.5J

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