When angle of incidence is more, then

1. lateral displacement is less
2. lateral displacement is more
3. lateral displacement is independent of incidence angle
4. zero

A pendulum is oscillating on either side of its rest position. The correct statement is

1. It has only the kinetic energy at its each position.
2. It has maximum kinetic energy at its extreme position.
3. It has the maximum potential energy at its mean position.
4. The sum of its kinetic energy and potential energy remain constant throughout the motion.

(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.

A uniform meter scale is in equilibrium as shown in the figure given below

Calculate the weight of the meter scale.