According to Kepler's second law the earth travels fastest when it is closest to the sun. Is this consistent with the law of gravitation? Explain.

Derive Newton's law of gravitation from Kepler's law.

According to the second law of thermodynamics , a process (reaction is) spontaneous, if during the process

When a glass rod is rubbed with a silk cloth, charges appear on both. A similar phenomenon is observed with many other pairs of bodies. Explain how this observation is consistent with the law of conservation of charge.

When a glass rod is rubbed with a silk cloth, charges appear on both. A similar phenomenon is observed with many other pairs of bodies. Explain how this observation is consitent with the law of conservation of charge.

Is the sun's gravitational pull on the earth the same in all seasons of the year ? Explain.

Derive Kepler's second law of planetary motion,using the law of conservation of angular momentum.

"The energy flow in the ecosystem follows the second law of thermodynamics." explain.

Explain why an apple should fall down to meet the earth instaed of earth moving upwards to meet the apple, when the gravitational pull is the same in both cases.