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Underline the correct alternative:
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.
State if each of the following statements is true or false. Give reasons for your answer.
Total energy of a system is always conserved, no matter what internal and external forces on the body are present.
The bob A of a pendulum released from 30° to the vertical hits another bob B of the same mass at rest on a table as shown in Fig. How high does the bob A rise after the collision? Neglect the size of the bobs and assume the collision to be elastic.
Consider the decay of a free neutron at rest : n → p + e–
Show that the two-body decay of this type must necessarily give an electron of fixed energy and, therefore, cannot account for the observed continuous energy distribution in the β-decay of a neutron or a nucleus
A molecule in a gas container hits a horizontal wall with speed 200 m s–1 and angle 30° with the normal, and rebounds with the same speed. Is momentum conserved in the collision? Is the collision elastic or inelastic?
- Physics Textbook for Class 11 Part 1