1
JEE Main 2019 (Online) 9th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
The energy required to take a satellite to a height 'h' above Earth surface (radius of Earth = 6.4 $$ \times $$ 103 km) is E1 and kinetic energy required for the satellite to be in a circular orbit at this height is E2. The value of h for which E1 and E2 are equal, is
A
1.6 $$ \times $$ 103 km
B
3.2 $$ \times $$ 103 km
C
6.4 $$ \times $$ 103 km
D
1.28 $$ \times $$ 104 km
2
JEE Main 2018 (Online) 16th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
Suppose that the angular velocity of rotation of earth is increased. Then, as a consequence :
A
Weight of the object, everywhere on the earth, will increase.
B
Weight of the object, everywhere on the earth, will decrease.
C
There will be no change in weight anywhere on the earth.
D
Except at poles, weight of the object on the earth will decrease.
3
JEE Main 2018 (Offline)
MCQ (Single Correct Answer)
+4
-1
Change Language
A particle is moving with a uniform speed in a circular orbit of radius R in a central force inversely proportional to the nth power of R. If the period of rotation of the particle is T, then :
A
T $$ \propto $$ Rn/2
B
T $$ \propto $$ R3/2 for any n
C
T $$ \propto $$ Rn/2 +1
D
T $$ \propto $$ R(n+1)/2
4
JEE Main 2018 (Online) 15th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
Take the mean distance of the moon and the sun from the earth to be $$0.4 \times {10^6}$$ km and $$150 \times {10^6}$$ km respectively. Their masses are $$8 \times {10^{22}}$$ kg and $$2 \times {10^{30}}$$ kg respectively. The radius of the earth is $$6400$$ km. Let $$\Delta {F_1}$$ be the difference in the forces exerted by the moon at the nearest and farthest points on the earth and $$\Delta {F_2}$$ be the difference in the force exerted by the sun at the nearest and farthest points on the earth. Then, the number closest to $${{\Delta {F_1}} \over {\Delta {F_2}}}$$ is :
A
$$2$$
B
$${10^{ - 2}}$$
C
$$0.6$$
D
$$6$$
JEE Main Subjects
EXAM MAP