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  • A dog of mass 10kg runs a speed of 5m/sec at surface of a circular drum of radius 1m. The drum can rotate about its own axis AB freely as shown in the figure. The motion of the dog causes the rotat

A dog of mass 10kg runs a speed of 5m/sec at surface of a circular drum of radius 1m. The drum can rotate about its own axis AB freely as shown in the figure. The motion of the dog causes the rotation of drum. The speed of rotation is such that relative position of the dog is unaltered. The kinetic energy of rotation of dog is

Option: 1

750J
 


Option: 2

125J
 


Option: 3

120J
 


Option: 4

40J


Answers (1)

best_answer

\text { Mass of dog }=10 \mathrm{~kg} \text {, }

\text { Radius of drum }=1 \mathrm{~m}

\text { Speed }=5 \mathrm{~m} / \mathrm{sec}

\mathrm{K} . \mathrm{E}=\frac{1}{2} \mathrm{~m} v^2

=\frac{1}{2} \times 10 \times 5^2

=125 \mathrm{~J}

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Divya Prakash Singh

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