Even when earth receives solar energy, why is it not getting warmed up continuously?

Even when no heat is exchanged by the contents of a thermos flask,m the contents get heated up by constant shaking. Why?

Debate the following issue in class. It is estimated that the sun will last for another five billion years. Do we have to worry about solar energy getting exhausted ? Why or why not ?

Why is an insulator sometimes called a dielectric? What is the main difference between free and bound charge? Generally one of the two plates of a Capacitor System is earthed, why? Derive the expression for the energy stored in a charged capacitor.

When a body falls freely towards the earth, then its total energy-

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

It is easier to catch, a table tennis ball than a cricket ball even when both are moving with same velocity. Why?

If the temperature of sun is doubled,the rate of energy received on earth wil be increased by a factor roughly

What is step up and step down transformer? To transfer electric energy from generating station initially step up transformer is used. Why?

Soni says that the acceleration in an object could be zero even when several forces are acting on it. Do you agree with her? Why?