Gravitation — Physics STD 11 Science — Question

To stop a moving bicycle, should we apply big or small brake?

A rectangular brick is kept on a table with a part of its length projecting out. It remains at rest if the length projected is slightly less than half the total length but it falls down if the length projected is slightly more than half the total length. Give reason.

Crystalline solids are called true solids. Why?

What is Stokes' law?

Good reflectors are poor emitters of thermal radiation. Explain.

Under what ideal condition can the efficiency of a Carnot engine be 100%?

Three stars A, B, C appear as green, red and blue respectively. Which star has minimum temperature?

Is it possible to heat a body without providing heat energy? How?

What is the ratio of the distances covered by a freely falling object in its first and second seconds?

Moving in a circular path of radius R, what will be the angular momentum of a particle of mass m and velocity v to the center of the circle?