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When is gravitational potential energy o...

When is gravitational potential energy of a body positive ?

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Positive gravitational potential energy implies that the body will perform work while returing from its present position (level) to zero level.
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What is gravitational potential energy?

What is gravitational potential energy ?

What is meant by gravitational potential energy of a body ? Derive an expression for the gravitational potential energy for a body of mass m lying at a distance r from the centre of Earth.

What is the gravitational potential energy of a body of mass m at a height h ?

A body of mass m is placed on the earth's surface . It is taken from the earth's surface to a height h = 3 R when R is the radius of the earth. The change in gravitational potential energy of the body is

What is meant by gravitational potential energy of a body ? What is the zero level of potential energy ?

Under what condition, the gravitational potential energy of a body will be zero?

If the gravitational potential energy of a body on a planet is numerically equal to . U and the escape velocity of the same body is V_(e') then

(a) On what factors does the gravitational potential energy of a body depend ? (b) Give one example each of a body possessing : (i) kinetic energy, and (ii) potential energy.

Knowledge Check

  • A body of mass m is placed on the earth's surface . It is taken from the earth's surface to a height h = 3 R when R is the radius of the earth. The change in gravitational potential energy of the body is

    A
    `3/2mgR`
    B
    `3/4mgR`
    C
    `1/2mgR`
    D
    `1/4mgR`

  • If the gravitational potential energy of a body on a planet is numerically equal to . U and the escape velocity of the same body is V_(e') then

    A
    `(U)/(V_(e))=m sqrt((GM)/(2R))`
    B
    `(U)/V^(e)=(mGM)/( R)`
    C
    `(U)/(V_(e))=m sqrt((GM)/(2R))`
    D
    `(U)/(V_(e))=m sqrt((2R)/(GM))`
    • PRADEEP-WORK AND ENERGY-Section - A mock Test
    1. When is gravitational potential energy of a body positive ?

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    2. What happens to their gravitational potential energy when firefighters...

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    3. The kinetic energy of a freely falling ball is not conserved. Why is t...

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    4. When a ball is hung from a vertical spring, it stretches the spring. ...

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    5. A block of wood loses 100 J of gravitational potential energy as it sl...

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    7. You lift a box weighing 200 N from the floor to a shelf 1.5 m above. ...

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    8. Why does a saw become warm when it is used to cut a log of wood ? Stat...

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    9. Find the power of an engine which lifts 90 metric tonnes of coal per h...

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    10. Distinguish between energy and power.

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    11. What is the commercial unit of electric energy? Obtain the relation be...

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    12. You can decrease the kinetic energy of an object as much as you want. ...

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    13. An automobile travelling with a speed 60 km//h , can brake to stop wi...

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    14. What do you mean by power ? Derive a relation between power and veloci...

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    15. What ids gravitational potential energy ? Obtain an expression for it ...

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    16. A tank of size 5 mxx 5m xx 5m is full of water and built on ground. Fi...

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    17. 300 Jof work is done in slide a 2kg block up an inclined plane of heig...

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