Physics
A uniform meter scale is in equilibrium as shown in the figure given below
Calculate the weight of the meter scale.
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Which is used in cure of cancer?
- Na-24
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- Co-60
- None of these
(a) A pulley cannot have 100% efficiency. Explain why?
(b) How is the unit 'horsepower' related to the SI unit of power?
(c) Write the two uses of radioactivity.
The distance between two bodies is decreased by a factor of 3. How is the magnitude of gravitational force between them affected ?
A force of 20 N displaces a body by a distance of 4 m. Find the amount of work done when the displacement is:
(a) in the direction of force.
(b) at an angle of 60° with the force.