Oscillations — Physics STD 11 Science — Question

Read each statement below carefully and state with reasons, if it is true or false: The total path length is always equal to the magnitude of the displacement vector of a particle.

An observer places his ear at the end of a long steel pipe. He can hear two sounds, when a workman hammers the other end of the pipe. Why?

What would happen to an artificial satellite, if its orbital velocity is slightly decreased due to some defects in it?

In a calorimeter, the heat given by the hot object is assumed to be equal to the heat taken by the cold object. Does it mean that heat of the two objects taken together remaina constant?

It is easier to pull lawn roller than to push it. Why?

What is a thermostat? Briefly explain its principle.

Why the work done by centripetal force on a particle moving in a circular path is zero?

What is the cause and outcome in a rotational motion?

You are walking along a seashore and a mild wind is blowing. Is the motion of air a wave motion?

What is the angle between frictional force and instantaneous velocity of the body moving on a rough road?