Question

The sum of all energies of all molecules in a body is called as.

(a) kinetic energy (b) potential energy

(c) internal energy (d) atomic energy​

Answer 1

INTERNAL ENERGY(C)

Internal energy=It is the sum of the total energy that is present in a substance or body.

So, then let us see the different kinds of forces that are present in the internal energy:

The internal energy is the sum of:

1)translational energy

2)kinetic energy

3)potential energy

4)vibrational energy

This energy is stored inside a body in the form of heat energy.

This heat energy is basically the sum of kinetic energy and potential energy.

Answer 2

(c)The sum of all energies of all molecules in a body is called internal energy.

The internal energy of a body comprises all the energies that the body possesses. It may consist of Kinetic energy, Potential energy, Rotational energy, Vibrational energy, etc. Following is some information about various types of energies of a body:

• Kinetic energy: It is possessed by the body due to motion.  The particles are in continuous motion and hence possess kinetic energy.
• Potential energy: It is possessed by the body due to the different relative positions of its constituents.
• Vibrational energy: It is possessed by the body due to the vibration of atoms.
• Rotational energy: It is possessed by the body due to the rotation of atoms of the body.

• Thermal energy: It is the sum of all the random types of energies due to motion.

Therefore, the sum of all the energies of a body is internal energy.