Q. 14

# The radius of gyration of a uniform disc about a line perpendicular to the disc equals its radius. Find the distance of the line from the centre.

Answer :

Given that –

According to the question the radius of gyration of the disc about a point is equal to the radius of disc.

This gives moment of inertia as –

Let us take a line parallel to this axis and at a distance d.

Then the radius of gyration becomes r

So, the moment of inertia can be calculated as –

We know, moment of inertia is given by,

Substituting

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Figure 5.9 shows (v_{x} ,t ),and( (v_{y} ,t) diagrams for a body of unit mass. Find the force as a function of time.

Physics - Exemplar

The door of an Amirah is 6 ft. high, 1.5 ft. wide and weighs 8 kg. The door is supported by two hinges situated at a distance of 1 ft. from the ends. If the magnitudes of the forces exerted by the hinges on the door are equal, find this magnitude.

HC Verma - Concepts of Physics Part 1Consider the following two equations

(A)

(B)

In non-inertial frames

HC Verma - Concepts of Physics Part 1