Physics

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Easy

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# The escape velocity of a sphere of mass m from earth having mass M and Radius R is given by

- 2

## The correct answer is:

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### The Gravitational P.E of a body of mas m at the earth's surface is -mg Re. Its gravitational potential energy at a height Re from the earth's surface will be = here (Re is the radius of the earth),

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### The Gravitational P.E of a body of mas at the earth's surface is -mg Re. Its gravitational potential energy at a height Re from the earth's surface will be = here (Re is the radius of the earth),

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### Escape velocity of a body of 1 kg. on a planet is 100ms^{-1} . Gravitational potential energy of the body at the planet is =.....j

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### The masses and radius of earth and moon are M_{1} ,R_{1 }and M_{2} R_{2 }respectively. Their centres are d distance of apart. The minimum velocity with which a particle of mass should be projected from a point mid way between their centres so that it escapes to infinity is……

### The masses and radius of earth and moon are M_{1} ,R_{1 }and M_{2} R_{2 }respectively. Their centres are d distance of apart. The minimum velocity with which a particle of mass should be projected from a point mid way between their centres so that it escapes to infinity is……

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### If P= where percentage error in and are respectively and then total percentage error in measurement of

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### The mass of the earth is 6.00 Kg and that of the moon is 7.40 kg. The constant of gravitation G=6.667Nm^{-2} kg^{--2}.The potential energy of the system is -7.79 Joules. the mean distance between the earth and moon is =

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For this question, we should know the rules of dot product.

### is perpendicular to , then

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For this question, we should know the rules of dot product.

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We should remember the formula of direction cosines of all the angles.

### The acute angle made by the line joining the points and with the -axis is

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We should remember the formula of direction cosines of all the angles.

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### If then the angle between and is

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