Waves — Physics STD 11 — Question

Give any two examples for parallelogram law of vectors.

Briefly explain how such a quasi-static process can be carried out.

Why does a gun recoils when a bullet is being fired?

An aircraft is flying at a height of 3400 m above the ground. If the angle subtended at a ground observation point by the aircraft position 10 second apart is 30°, what is the speed of the aircraft?

Define unit of power.

What is vibratory motion? Give example.

Two wires of same material and same diameter have lengths in the ratio 2 : 5. They are stretched by same force. Calculate the ratio of workdone in stretching them.

Two bodies stick together after collision. What type of collision is in between these two bodies? .

Name the technique used in locating.
(a) an under water obstacle
(b) position of an aeroplane in space.

Write an example of zero vector.