Short Answer TypeA brass ball is hanging from a stiff cotton thread. Draw a neat labelled diagram showing the forces acting on the brass ball and cotton thread.
The distance between two bodies is doubled. How is the magnitude of the gravitational force between them affected?
Why is a jack screw provided with a long arm?
A jack, screw jack or jackscrew is a mechanical device used as a lifting device to lift heavy loads or to apply great force. A jack screw is provided with a long arm in order to have the effort less than the load.
Moment of force (torque, which is responsible for turning effect of the body)
Rotation is given by the moment
Torque = Force x perpendicular length
Therefore, the long arm of the jack screw, the more force it can apply.
A solid of mass 50 g at 150°C is placed in 100 g of water at 11°C, when the final temperature recorded is 20°C. Find the specific heat capacity of the solid. (specific heat capacity of water = 4.2 J/g°C)
How is the refractive index of a material related to:
(i) real and apparent depth?
(ii) velocity of light in vacuum or air and the velocity of light in a given medium?
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