1
JEE Main 2021 (Online) 18th March Evening Shift
+4
-1
If the angular velocity of earth's spin is increased such that the bodies at the equator start floating, the duration of the day would be approximately : [Take g = 10 ms$$-$$2, the radius of earth, R = 6400 $$\times$$ 103 m, Take $$\pi$$ = 3.14]
A
84 minutes
B
1200 minutes
C
60 minutes
D
does not change
2
JEE Main 2021 (Online) 18th March Evening Shift
+4
-1
The angular momentum of a planet of mass M moving around the sun in an elliptical orbit is $${\overrightarrow L }$$. The magnitude of the areal velocity of the planet is :
A
$${{2L} \over M}$$
B
$${{L} \over 2M}$$
C
$${{L} \over M}$$
D
$${{4L} \over M}$$
3
JEE Main 2021 (Online) 18th March Morning Shift
+4
-1
The time period of a satellite in a circular orbit of radius R is T. The period of another satellite in a circular orbit of radius 9R is :
A
9 T
B
27 T
C
12 T
D
3 T
4
JEE Main 2021 (Online) 17th March Evening Shift
+4
-1
A geostationary satellite is orbiting around an arbitrary planet 'P' at a height of 11R above the surface of 'P', R being the radius of 'P'. The time period of another satellite in hours at a height of 2R from the surface of 'P' is _________. 'P' has the time period of 24 hours.
A
3
B
5
C
$$6\sqrt 2$$
D
$${6 \over {\sqrt 2 }}$$
EXAM MAP
Medical
NEET