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Physics

General

Easy

Question

A particle falls towards earth from infinity. It's velocity reaching the earth would be……

Infinity
$\sqrt{2 g r}$
2 $\sqrt{g R}$
Zero

The correct answer is: $square root of 2 g r end root$

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Radius of orbit of satellite of earth is R. Its K.E is proportional to

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Energy required to move a body of mass m from an orbit of radius 2R to 3R is

A body is projected vertically upwards from the surface of a planet of radius R with a velocity equal to half the escape velocity for that planet. The maximum height attained by the body is….

A body is projected vertically upwards from the surface of a planet of radius R with a velocity equal to half the escape velocity for that planet. The maximum height attained by the body is….

parallel

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),

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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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

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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What is the intensity of gravitational field at the center of spherical shell

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A rocket is launched with velocity 10 $k m s to the power of negative 1 end exponent$ . If radius of earth is R then maximum height attained by it will be =…….

A rocket is launched with velocity 10 $k m s to the power of negative 1 end exponent$ . If radius of earth is R then maximum height attained by it will be =…….

The masses and radius of earth and moon are M₁ ,R₁and M₂ R₂respectively. 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 M₁ ,R₁and M₂ R₂respectively. 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= $fraction numerator A to the power of 2 end exponent B over denominator C to the power of 3 end exponent end fraction$ where percentage error in $A comma B$ and $C$ are respectively $plus 2 percent sign plus-or-minus 3 percent sign$ and $plus-or-minus 5 percent sign$ then total percentage error in measurement of $p$

If P= $fraction numerator A to the power of 2 end exponent B over denominator C to the power of 3 end exponent end fraction$ where percentage error in $A comma B$ and $C$ are respectively $plus 2 percent sign plus-or-minus 3 percent sign$ and $plus-or-minus 5 percent sign$ then total percentage error in measurement of $p$

physics-General

The mass of the earth is 6.00 $cross times 10 to the power of 24$ Kg and that of the moon is 7.40 $cross times 10 to the power of 22$ kg. The constant of gravitation G=6.667 $cross times 10 negative 11 to the power of blank$ Nm^-2 kg^--2.The potential energy of the system is -7.79 $cross times 10 to the power of 28$ Joules. the mean distance between the earth and moon is =

The mass of the earth is 6.00 $cross times 10 to the power of 24$ Kg and that of the moon is 7.40 $cross times 10 to the power of 22$ kg. The constant of gravitation G=6.667 $cross times 10 negative 11 to the power of blank$ Nm^-2 kg^--2.The potential energy of the system is -7.79 $cross times 10 to the power of 28$ Joules. the mean distance between the earth and moon is =

$text If end text a with not stretchy bar on top equals ı with not stretchy bar on top plus 2 ȷ with not stretchy bar on top plus 3 k with not stretchy bar on top comma b with not stretchy bar on top equals negative ı with not stretchy bar on top plus 2 ȷ with not stretchy bar on top plus k with not stretchy bar on top comma c with not stretchy bar on top equals 3 ı with not stretchy bar on top plus ȷ with not stretchy bar on top text and end text a with not stretchy bar on top plus t b with not stretchy bar on top$ is perpendicular to $stack c with ‾ on top$ , then $t equals$

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

$text If end text a with not stretchy bar on top equals ı with not stretchy bar on top plus 2 ȷ with not stretchy bar on top plus 3 k with not stretchy bar on top comma b with not stretchy bar on top equals negative ı with not stretchy bar on top plus 2 ȷ with not stretchy bar on top plus k with not stretchy bar on top comma c with not stretchy bar on top equals 3 ı with not stretchy bar on top plus ȷ with not stretchy bar on top text and end text a with not stretchy bar on top plus t b with not stretchy bar on top$ is perpendicular to $stack c with ‾ on top$ , then $t equals$

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

parallel

The acute angle made by the line joining the points $left parenthesis 1 comma negative 32 right parenthesis$ and $left parenthesis 3 comma negative 51 right parenthesis$ with the $Y$ -axis is

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

The acute angle made by the line joining the points $left parenthesis 1 comma negative 32 right parenthesis$ and $left parenthesis 3 comma negative 51 right parenthesis$ with the $Y$ -axis is

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

If $a with bar on top equals negative ı with bar on top plus ȷ with bar on top plus 2 k with bar on top comma b with bar on top equals 2 l with bar on top plus ȷ with bar on top minus k with bar on top comma c with bar on top equals negative 2 l with bar on top plus ȷ with bar on top plus 3 k with bar on top$ then the angle between $2 a with not stretchy bar on top minus c with not stretchy bar on top$ and is

If $a with bar on top equals negative ı with bar on top plus ȷ with bar on top plus 2 k with bar on top comma b with bar on top equals 2 l with bar on top plus ȷ with bar on top minus k with bar on top comma c with bar on top equals negative 2 l with bar on top plus ȷ with bar on top plus 3 k with bar on top$ then the angle between $2 a with not stretchy bar on top minus c with not stretchy bar on top$ and is

In a gravitational field, at a point where the gravitational potential is zero

In a gravitational field, at a point where the gravitational potential is zero

parallel

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