Rotational Motion (KVPY Stream SB-SX (Class 12 & 1st Year BSC) Physics): Questions 1 - 2 of 13

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Question number: 1

» Rotational Motion » Conservation of Angular Momentum

Appeared in Year: 2012

MCQ▾

Question

A planet orbits in an elliptical path of eccentricity e around a massive star considered fixed at one of the foci. The point in space where it is closest to the star is denoted by P and the point where it is farthest is denoted by A. Let VP and VA are be the respective speeds at P and A. Then –

A planet orbit in an elliptical path

A Planet Orbit in an Elliptical Path

In figure a planet orbits in an elliptical path of eccentricity e around a massive star consideration fixed at one of the foci.

Choices

Choice (4) Response

a.

VPVA=1+e1e

b.

VPVA=1+e21e

c.

VPVA=1

d.

VPVA=1+e21e2

Question number: 2

» Rotational Motion » Moment of Inertia

Appeared in Year: 2012

MCQ▾

Question

Seven identical coins are rigidly arranged on a flat table in the pattern shown below so that each coin touches its neighbors. Each coin is a thin disc of mass m and radius r. Note that the moment of inertia of an individual coin about an axis passing through center and perpendicular to the plane of the coin is mr22 .

Arrangement of seven identical coins

Arrangement of Seven Identical Coins

In figure seven identical coins are rigidly arranged on a flat table in the pattern such that each coin touches its neighbors.

The moment of inertia of the system of seven coins about an axis that passes through the point P (the centre of the coin positioned directly to the right of the central coin) and perpendicular to the plane of the coins is-

Choices

Choice (4) Response

a.

1272mr2

b.

55mr2

c.

1112mr2

d.

552mr2

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