A baloon filled with helium rises against gravity increasing its potential energy. The speed of the baloon also increases as it rises. How do you reconcile this with the law of conservation of mechanical energy ? You can neglect viscous drag of air and assume that density of air is constant.

A ballon filled with helium rises against gravity increasing its potential energy . The speed of thee ballon also increases as it rises . How do you reconcile this with the law of conservation of mechanical energy ? You can neglect viscous drag of air and assume that density of air is constant .

A ballon filled with helium rises against gravity increasing its potential energy. the speed of the ballon also increases as it rises. How do you reconcile this with the law of conservation of mechanical energy ? You can neglect viscous drag of air and assume that density of air constant.

When you lift a box from the floor and put it on an almirah the potential energy of the box increases but there is no change in its kinetic energy. Is it violation of conservation of energy. Explain.

When you lift a box from the floor and put it on an almirah the potential energy of the box increases bu there is no change in its kinetic energy. Is it violation of conservation of energy ? Explain. (AS_(7))

When you lift a box from the floor and put it on an almirah the potential energy of the box increases bu there is no change in its kinetic energy. Is it violation of conservation of energy ? Explain. (AS_(7))

What do you mean by the internal energy of an ideal gas? How can you increase the internal energy of a gaseous system?

Underline the correct alterntaive: a) when a conservative force does positivie work on a body, the potential energy of the body increase/decreases/remains unaltered. work done by a body against friction always results in a loss of its kinetic /potential energy. c) The rate of change of total momentum of a many-particle system is proportional to the external force/ sum of the internal forces on the system. d) In an inelastic collision of two bodies, the quantities which do not change after the collision are the total kinetic energy/total linear momentum/total enregy of the system of two bodies.

Underline the correct alterntaive: a) when a conservative force does positivie work on a body, the potential energy of the body increase/decreases/remains unaltered. work done by a body against friction always results in a loss of its kinetic /potential energy. c) The rate of change of total momentum of a many-particle system is proportional to the external force/ sum of the internal forces on the system. d) In an inelastic collision of two bodies, the quantities which do not change after the collision are the total kinetic energy/total linear momentum/total enregy of the system of two bodies.

The size of air bubbles rising from the bottom of an aquarium increases. Can you explain the reason? What do you observe?