Gravitation Test

Result

Gravitation Test - 2

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Question 1
1 / -0

Gravity is a conservative force. Which of the following is incorrect?

A
Force always points towards a certain point in space.

B
The work done on moving a particle from one point to another doesn`t depend on path.

C
Mechanical energy remains constant.

D
Kinetic energy remains constant.

Solution

For the conservative forces, work done is independent of the path followed. The force between the two particles is always directed towards the line joining the particles. The total mechanical energy is conserved, but there is a change in the kinetic energy as well as in the potential energy.
Question 2
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Escape velocity from earth is approximately

A
11.2 km/s

B
11.2m/s

C
11.2 km/h

D
11.2m/h

Solution

Escape velocity from the earth is approximately 11.2 km/s.
Question 3
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If the earth is replaced by a small point sized particle of the same mass, it is geodesic centre. How will the force of gravity change at the present surface of earth? (Assuming earth to be a perfect sphere)

A
Force of gravity increases.

B
Force of gravity decreases.

C
Force of gravity varies place to place.

D
No change

Solution

As the R & M remains the same, so g will remain the same.