Question 2 :
A pendulum clock which keeps correct time at the surface of the earth is taken into a mine, then<br>
Question 3 :
A pendulum beats seconds on the earth. Its time period on a stationary satellite of the earth will be
Question 4 :
If the gravitational force of earth suddenly disappears, then which of the following is correct?<br>
Question 5 :
Two satellites of masses 400 kg, 500 kg are revolving around earth in different circular orbits of radii $r_{1}$, $r_{2}$ such that their kinetic energies are equal. The ratio of $r_{1}$, $r_{2}$ is<br>
Question 6 :
An earth's satellite is moving in a circular orbit with a uniform speed v. If the gravitational force of the earth suddenly disappears, the satellite will:-
Question 7 :
A satellite is in a circular orbit around the earth at an altitude $R$ above the earth's surface, where $R$ is the radius of the earth. If $g$ is the acceleration due to gravity on the surface of the earth, the speed of the satellite is:
Question 8 :
When a small mass $m$ is suspended at lower end of the elastic wire having upper end fixed with ceiling. There is loss in gravitational potential energy. let it be x, due to extension of wire, mark correct option,
Question 9 :
WEIGHTLESSNESS<br>An astronaut experiences weightlessness in a space satellite. It is because
Question 10 :
Which of the followings are correct uses of satellite placed in an orbit around Earth?
Question 11 :
At the centre of the earth acceleration due to gravity is:
Question 12 :
Two satellites of mass $m_1$ and $m_2 (m_1 > m_2) $ revolve round the earth in circular orbits of radii $r_1$ and $r_2$ respectively $(r_1 > r_2)$ Their speeds are related as
Question 13 :
Find the height above the surface of the earth where weight of a body becomes half.
Question 14 :
If density of the earth is doubled keeping its radius constant, then acceleration due to gravity (present value $9.8  m/s^2$) will be:
Question 15 :
If the mass of the Sun were ten times smaller and the universal gravitational constant were ten times larger in magnitude, which of the following is not correct?
Question 16 :
If the mass and radius of a planet are doubled, then acceleration due to gravity on its surface will become :
Question 17 :
The jupiter's period of revolution around the sun is 12 times that of the earth. If radius of earth orbit is 1 AU, find radius of Jupiter's orbit<br/>
Question 18 :
The escape velocity of a body from earths surface is $V_{e}$. The escape velocity of the same body from a height equal to $7R$ from the earths surface will be<br/>
Question 19 :
An artificial satellite around a planet for which gravitational force $(F)$ varies with distance $r$ from its center as $F \propto r^2$ If $v_0$ its orbital speed. then
Question 20 :
If $g$ on the surface of the earth is $9.8/ m{s}^{-2}$, its value at a depth of $3200\ km$ (Radius of the earth=$6400\ km$) is