Gravitation-Energy (KVPY Stream-SA (Class 11) Physics): Questions 1 - 3 of 3

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Question number: 1

» Gravitation » Energy

Appeared in Year: 2015

MCQ▾

Question

A planet is orbiting the sun is an elliptical orbit. Let U denote the potential energy and K denote the kinetic energy of the planet at an arbitrary point on the orbit. Choose the correct statement

Choices

Choice (4) Response
a.

K= U for two positions of the planet in the orbit

b.

K= U always

c.

K< U always

d.

K> U always

Question number: 2

» Gravitation » Energy

MCQ▾

Question

Two starts each of 1 solar mass (2×1030kg) are approaching each other for a head-on collision. When they are at a distance of 3 ⨯ 107 km, their speeds are negligible. The speed with which they collide is –

(The radius of each star is 105 km, assume the stars to remain undistorted until they collide. G=6.67×1011N×m2kg2 . )

Choices

Choice (4) Response
a.

2.582×109ms

b.

2.574×107ms

c.

3.82×107ms

d.

2.574×109ms

Question number: 3

» Gravitation » Energy

MCQ▾

Question

Two starts each of 1 solar mass (2×1030kg) are approaching each other for a head-on collision. When they are at a distance of 109 km, their speeds are negligible. The speed with which they collide is –

(The radius of each star is 104 km, assume the stars to remain undistorted until they collide. G=6.67×1011N×m2kg2 . )

Choices

Choice (4) Response
a.

3.82×1016ms

b.

2.582×1012ms

c.

3.82×1012ms

d.

2.582×1016ms

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