Gravitation — Physics STD 11 Science — Question

Two soap bubbles have radii in the ratio 2 : 3. Calculate the ratio of work done in blowing these bubbles.

Why does tides arise in the oceans?

A piece of lead is hammered. Does its internal energy increase? Does the heat enter the lead from outside?

Two particles A and B start from rest and move for equal time on a straight line. The particle A has an acceleration a for the first half of the total time and 2a for the second half. The particle B has an acceleration 2a for the first half and a for the second half. Which particle has covered larger distance?

What will the effect on time period if a hollow sphere of the same size is used instead of a solid iron sphere in a simple pendulum.

Is the damping force constant on a system executing SHM?

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

How many times in one vibration, K.E. and P.E. become maximum?

A black metal foil is warmed by radiation from a sphere at temperature T at a distance d. If the power received is P, find the power received when both the temperature and distance are doubled.

What are the two conditions when a real gas follow the ideal gas equation PV = nRT?