CBSE
The period of oscillation of a simple pendulum of constant length at the surface of the earth is T. Its time period inside a mine will be :
can not be compared
equal to T
less than T
more than T
The radius of orbit of a planet is two times that of the earth. The time period of the planet is :
4.2 T
2.8 T
5.6 T
8.4 T
A body falls from a height h = 200 m. The ratio of distance travelled in each 2 sec, during t = 0 to t = 6 second of the journey is
1 : 4 : 9
1 : 2 : 4
1 : 3 : 5
1 : 2 : 3
The distance between the sun and the earth be r then the angular momentum of the earth around the sun is proportional to :
r
none of these
Two satellites A and B go around a planet P in circular orbits having radius 4 R and R respectively. If the speed of satellite A is 3v, then the speed of satellite B will be
6v
9v
3v
none of these
A particle falls towards earth from infinity. Its velocity on reaching the earth would be:
infinity
zero
According to Kepler's law, the time period of a satellite varies with its radius are as:
T2 ∝ R3
T3 ∝ R2
Acceleration due to gravity:
decreases from the equator to poles
decreases from poles to the equator
is maximum at the centre of the earth
is maximum at the equator
The radius of orbit of satellite of earth is R. Its kinetic energy is proportional to :
R
The length of the second's pendulum is 1 m on earth. If the mass and diameter of a planet are doubled than that of earth. Then its length becomes
1 m
2 m
0.5 m
4 m