JEE Main 2018 (Online) 16th April Morning Slot | Gravitation Question 112 | Physics

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JEE Main 2018 (Online) 16th April Morning Slot

MCQ (Single Correct Answer)

-1

Suppose that the angular velocity of rotation of earth is increased. Then, as a consequence :

Weight of the object, everywhere on the earth, will increase.

Weight of the object, everywhere on the earth, will decrease.

There will be no change in weight anywhere on the earth.

Except at poles, weight of the object on the earth will decrease.

JEE Main 2018 (Offline)

MCQ (Single Correct Answer)

-1

A particle is moving in a circular path of radius $$a$$ under the action of an attractive potential $$U = - {k \over {2{r^2}}}$$ Its total energy is:

$$ - {3 \over 2}{k \over {{a^2}}}$$

Zero

$$ - {k \over {4{a^2}}}$$

$$ {k \over {2{a^2}}}$$

JEE Main 2018 (Offline)

MCQ (Single Correct Answer)

-1

A particle is moving with a uniform speed in a circular orbit of radius R in a central force inversely proportional to the n^th power of R. If the period of rotation of the particle is T, then :

T $$ \propto $$ R^n/2

T $$ \propto $$ R^3/2 for any n

T $$ \propto $$ R^{n/2 +1}

T $$ \propto $$ R^(n+1)/2

JEE Main 2018 (Online) 15th April Morning Slot

MCQ (Single Correct Answer)

-1

A body of mass m is moving in a circular orbit of radius R about a planet of mass M. At some instant, it splits into two equal masses. The first mass moves in a circular orbit of radius $${R \over 2},$$ and the other mass, in a circular orbit of radius $${3R \over 2}$$. The difference between the final and initial total energies is :

$$ - {{GMm} \over {2R}}$$

$$ + {{GMm} \over {6R}}$$

$${{GMm} \over {2R}}$$

$$ - {{GMm} \over {6R}}$$

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