When we rub our hands they become warm. Have we supplied heat to the hands?

Why does our mouth becomes watery when we eat the food of our choice ?

Why don't we hear sounds when our ears are closed?

When we stir a liquid vigorously, it becomes warm. Is it a reversible process?

When we clap our hands, the sound produced is best described by Here p denotes the change in pressure from the equilibrium value

When we try to close a water tap with our fingers, fast jets of water gush through the openings between our fingers.

Why do we call our heart myogenic?

When the hands are brought closer to the body, the angular velocity of the ice dancer

When Neils Bohr shook hand with Werner Heisenberg, what kind of force they exerted?

If we put a cardboard (say 20 cm xx 20 cm) between a light source and our eyes, we can't see the light. But when we put the same cardboard between a sound source and our ear, we hear the sound almost clearly, Explain.

The temperature of an object is observed to rise in a period. In this period (i) Heat is certainly supplied to it (ii) Heat is certainly not supplied to it (iii) heat may have been supplied to it (iv) work may have been done on it.