PART - 2 CH - 13 Oscillations — Physics STD 11 Science — Question

Where does a body weigh more; at the surface of the earth or in a mine?

Does the speed increase, decrease or remain constant when a planet comes closer to the sun?

Suppose a charged particle moves with a velocity v near a wire carrying an electric current. A magnetic force, therefore, acts on it. If the same particle is seen from a frame moving with velocity v in the same direction, the charge will be found at rest. Will the magnetic force become zero in this frame? Will the magnetic field become zero in this frame?

In the above given problem if the lower thread is pulled with a jerk, what happens?

Which harmonic will generate in close organ pipe?

Explain why
Atmospheric pressure at a height of about 6km decreases to nearly half of its value at the sea level, though the height of the atmosphere is more than 100km.

Water is slowly coming out from a vertical pipe. As the water descends after coming out, its area of cross-section reduces. Explain this on the basis of the equation of continuity.

If the velocity of a particle is fixed, can its speed change?

What is the source of centripetal force, when an electron revolves around the nucleus?

A simple pendulum is transferred from earth to the surface of moon. How will its time period be affected?