Waves — Physics STD 11 Science — Question

A ball is thrown in horizontal direction from the top of a tower and another ball is dropped from the top of same tower. What will be the time difference between both the balls to reach the earth?

What is momentum and on which factors it depends?

Why is it difficult to walk on solid ice?

What is the method of transmission of heat without the help of any medium called?

It is easier to roll a barrel than to pull it along the road. Why?

A ballet dancer stretches her hand out for slowing down. Name the conservation obeyed.

State the factors on which the speed of a wave travelling along a stretched ideal string depends.

A body is dropped from the ceiling of a transparent cabin falling freely towards the earth. Describe the motion of the body as observed by an observer (a) sitting in the cabin  (b) standing on earth.

What is the condition for the difference between the length of a certain brass rod and that of a steel rod to be constant at all temperature?

A vessel with adiabatic walls has two chambers. One chamber is filled with gas and the other is a vacuum. The room divider suddenly bursts. What will be the change in the internal energy of the gas in this process?