Gravitation — Physics STD 11 Science — Question

What happens to coefficient of friction, when weight of body is doubled?

If all the objects radiate electromagnetic energy, why do not the objects around us in everyday life become colder and colder?

A planet revolves around a massive star in a highly elliptical orbit. Is its angular momentum conserved over the entire orbit?

What is the value of modulus of rigidity for a liquid?

A person is viewing an extended object. If a converging lens is placed in front of his eyes, will he feel that the size has increased?

On what factors does the rate of heat emitted by a hot object depend?

A body of mass 2kg initially at rest moves under the action of an applied horizontal force of 7N on a table with coefficient of kinetic friction = 0.1. Compute the: Work done by the applied force in 10s.

If all the particles of a system lie in X-Y plane, is it necessary that the centre of mass be in X-Y plane?

Fill in the blanks using the word(s) from the list appended with statement: Surface tension of liquids generally . . . with temperatures. (increases/ decreases)