A bar magnet is released from rest along the axis of a very long vertical copper tube. After some time the magnet will

Two projectiles are projected at $$30^{\circ}$$ and $$60^{\circ}$$ with the horizontal with the same speed. The ratio of the maximum height attained by the two projectiles respectively is:

A gas is compressed adiabatically, which one of the following statement is NOT true.

For a periodic motion represented by the equation

$$y=\sin \omega \mathrm{t}+\cos \omega \mathrm{t}$$

the amplitude of the motion is