Orbital Velocity Multiple Questions and Answers.
Exercise Questions ::
Kinetic Theory of Gases
| 1. | The mass of the moon is 1% of the mass of the earth. The ratio of gravitational pull on moon and that of moon in earth will be ? |
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| A. | 1:1 |
| B. | 1:10 |
| C. | 1:100 |
| D. | 2:1 |
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| Answer: Option A |
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| Explanation: |
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Gravitational forces are mutually equal and opposite. |
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Published by:Michael Daani
| 2. | If the earth loses its gravity, then for a body ? |
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| A. | Weight becomes zero |
| B. | Mass becomes zero |
| C. | Neither mass nor weight is zero |
| D. | Both mass and weight are zero |
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| Answer: Option A |
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| Explanation: |
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Weight = mg
As g becomes zero, weight is zero. Mass is the quantity of matter which is independent of g. |
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Tutorial Link: |
Published by:Michael Daani
| 3. | A ball is dropped from a spacecraft revolving around the earth at a height of 120km. What will happen to the ball? |
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| A. | It will go very far in the space |
| B. | It will move with the same speed tangentially to the spacecraft |
| C. | It will fall down to the earth gradually |
| D. | It will continue to move with the same speed along the original orbit of the spacecraft |
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| Answer: Option D |
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| Explanation: |
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In the absence of external torque the ball will continue to move with the same speed along the original orbit of spacecraft. |
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Tutorial Link: |
Published by:Michael Daani
| 4. | The velocity with which a projectile must be fired so that it escapes the earth’s gravitational field doesn’t depend on? |
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| A. | Mass of the earth |
| B. | Mass of the projectile |
| C. | Radius of the orbit |
| D. | Universal gravitational constant |
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| Answer: Option A |
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| Explanation: |
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Escape velocity does not depend on the mass of the projectile. |
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Tutorial Link: |
Published by:Michael Daani
| Answer: Option B |
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| Explanation: |
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From the earth’s surface,
ve=√2gR=11.2km/sec. |
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Tutorial Link: |
Published by:Michael Daani
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