# NCERT Class 11 Physics Solutions: Chapter 14 – Oscillations-Part 10

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Question 14.14:

The piston in the cylinder head of a locomotive has a stroke (twice the amplitude) of . If the piston moves with simple harmonic motion with an angular frequency of , what is its maximum speed?

Answer:

Angular frequency of the piston, .

Stroke

Amplitude,

The maximum speed of the piston is give by the relation:

Question 14.15:

The acceleration due to gravity on the surface of moon is . What is the time period of a simple pendulum on the surface of moon if its time period on the surface of earth is ? (g on the surface of earth is )

Answer:

Acceleration due to gravity on the surface of moon,

Acceleration due to gravity on the surface of earth,

Time period of a simple pendulum on earth,

Where,

is the length of the pendulum

The length of the pendulum remains constant.

On moon’s surface, time period,

Hence, the time period of the simple pendulum on the surface of moon is