EASY
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Given below are two statements:

Statement I : Rotation of the earth shows effect on the value of acceleration due to gravity (g).

Statement II : The effect of rotation of the earth on the value of g at the equator is minimum and that at the pole is maximum.

In the light of the above statements, choose the correct answer from the options given below

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Important Questions on Gravitation

HARD
A plank is resting on a horizontal ground in the northern hemisphere of the Earth at a 45o latitude. Let the angular speed of the Earth be ω and its radius re . The magnitude of the frictional force on the plank will be
MEDIUM

Directions: Each of the following sentences in this section has a blank space and four words or group of words given after the sentence. Select the word or group of words you consider most appropriate for the blank space and indicate your response on the Answer Sheet accordingly.

Every rash driver becomes a ____ killer.

MEDIUM
If the Earth has no rotational motion, the weight of a person on the equator is W. Determine the speed with which the earth would have to rotate about its axis so that the person at the equator will weigh 34 W. The radius of the Earth is 6400 km and g=10 m s-2
MEDIUM
A box weighs 196N on a spring balance at the north pole. Its weight recorded on the same balance if it is shifted to the equator is close to (Take g=10ms-2 at the north pole and the radius of the earth =6400km ):
EASY
Suppose that the angular velocity of rotation of the Earth is increased. Then, as a consequence,
EASY
Dependence of intensity of gravitational field E of earth with distance r from centre of earth is correctly represented by:
MEDIUM
The depth d at which the value of acceleration due to gravity becomes 1n times the value at the earth's surface is (R = radius of the earth )
EASY
The acceleration due to gravity on the earth's surface at the poles is g and angular velocity of the earth about the axis passing through the pole is ω. An object is weighed at the equator and at a height h above the poles by using a spring balance. If the weights are found to be same, then h is: (hR, where R is the radius of the earth)
EASY

Two sentences are given below and you are required to find the correct sentence which combines both the sentences.

Which is the correct combination of the given two sentences?

He is too tired. He could not stand.

EASY
Starting from the center of the earth having radius, R, the variation of g (acceleration due to gravity) is shown by
MEDIUM

In the following sentence, a blank space with four options is given. Select whichever preposition or determiner you consider the most appropriate for the blank space.

These are the good rules to live _____.

EASY
If the change in the value of g at a height h above the surface of the earth is the same as at a depth x below it, then (both x and h being much smaller than the radius of the earth)
MEDIUM
The ratio of the weight of a body at a height of R10 from the surface of the earth to that at a depth of R10 is (R is radius of earth)
EASY
The acceleration due to gravity at a height 1 km above the earth is the same as at a depth d below the surface of earth. Then
MEDIUM

The height h at which the weight of a body will be the same as that at the same depth h from the surface of the earth is,

(Radius of the earth is R and effect of the rotation of the earth is neglected) 

MEDIUM
What is the depth at which the value of acceleration due to gravity becomes 1n times the value at the surface of the earth? (radius of the earth =R)
EASY
A body weighs 72 N on the surface of the earth. What is the gravitational force on it, at a height equal to half the radius of the earth?
EASY
The variation of acceleration due to gravity g  with distance d from the centre of the earth is best represented by (R= Earth's radius):
HARD

A very long (length L) cylindrical galaxy is made of uniformly distributed mass and has radius R (R<<L). A star outside the galaxy is orbiting the galaxy in a plane perpendicular to the galaxy and passing through its centre. If the time period of the star is T and its distance from the galaxy's axis is r, then

EASY
At what height from the surface of earth the gravitation potential and the value of g are -5.4×10J kg-2 and 6.0 s-2 respectively? Take the radius of earth as 6400 km: