Thermodynamics — Physics STD 11 Science — Question

A ball is dropped on a floor from a height of 2.0m. After the collision it rises up to a height of 1.5m. Assume that 40% of the mechanical energy lost goes as thermal energy into the ball. Calculate the rise in the temperature of the ball in the collision. Heat capacity of the ball is 800JK^-1.

A man is standing on top of a building 100m high. He throws two balls vertically, one at t = 0 and other after a time interval (less than 2 seconds). The later ball is thrown at a velocity of half the first. The vertical gap between first and second ball is +15m at t = 2s. The gap is found to remain constant. Calculate the velocity with which the balls were thrown and the exact time interval between their throw.

What are the necessary conditions for a process to be reversible?

Why are mountain roads generally made winding upwards rather than going straight up?

Two springs of force constant k₁ and k₂ are joined in parallel. What is the force constant of the combination?

A block of wood is floating in a lake. What is apparent weight of the floating block?

Can a body in linear motion be in equilibrium?

A body falling from a height of 10m rebounds from a hard floor. It loses 20% of its energy in impact. What is the height to which it would rise after the impact?

Why are gas thermometers more sensitive than mercury thermometers?