Identify each of the following as an example of a change in

Identify each of the following as an example of a change in Kinetic Energy or an example of a change in Internal Energy. A baseball (the system) is thrown from the glove of the short stop in the direction of the first baseman. Two hydrogen atoms (the system) are initially infinitely far apart, but move close enough together to form a hydrogen molecule. The water molecules (the system) in a cup of soup are excited by microwaves. The cup of soup in Part c (the system) is removed from the microwave oven then dropped.

Solution

Kinetic Energy- When the energy gained by the object is because of its motion it is called kinetic energy.It is the work required to move the body from rest.

Thus A & D are case of change in kinetic energy as external work is done to move the objects

Internal Energy- It is the energy contained in the system.It is the account of gain or loss of energy due to change in internal state and not due to external forces

Thus B & C are examples of change in Internal Energy