Question 1 :
If the radius of earth were to shrink by one percent, its mass remaining the same, the acceleration due to gravity on the earth's surface would<br>
Question 2 :
The minimum number of geostationary satellites required to televise a programme all over the earth is<br>
Question 3 :
<u></u>A satellite is revolving near the earth's surface. Its orbital velocity is<br>
Question 5 :
When a satellite going round the earth in a circular orbit of radius $r$ and speed $v$ loses some of its energy, then $r$ and $v$ change as<br>
Question 6 :
The time period of an earth satellite in circular orbit is independent of:
Question 7 :
Time period of a satellite in an orbit of radius R is T. Its period of revolution in an orbit of radius 4R will be<br>
Question 8 :
As we go from equator to the poles, the value of g :
Question 9 :
Two satellites of masses $50 kg$ and $100 kg$ revolve around the earth in circular orbit of radii $9R$ and $16 R$ respectively, where R is the radius of the earth. The speeds of the two satellites will be in the ratio<br/>
Question 10 :
Let $g_h$ and $g_d$ be the acceleration due to gravity at height h above the earth's surface and at depth d below the earth's surface respectively. If $g_h=g_d$, then the relation between h and d is
Question 11 :
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 12 :
LANDSAT series of satellites move in near polar orbits at an altitude of
Question 14 :
While orbiting around the earth in a apaceship, an astronaut experiences
Question 15 :
Two satellites A and B move round the earth in the same orbit. The mass of B is twice the mass of A.Which of the following is correct?
Question 16 :
If suddenly the gravitational force of attraction between the earth and a satellite revolving around it becomes zero, what will happen?
Question 17 :
If both the mass and radius of the earth decrease by $1$% the value of<br>
Question 18 :
If the change in the value of '$g$' at a height $h$ above the surface of the earth is the same as at a depth $d$ below it. When both $d$ and $h$ are much smaller than the radius of earth, then
Question 19 :
Two identical spherical masses are kept at some distance. Potential energy when a mass $m$ is taken from the surface of one sphere to the other
Question 21 :
The gravitational field is a conservative field. The work done in this field by moving an object from one point to another<br>
Question 22 :
As a body moves from the equator to the poles, the value of g experienced by the body
Question 23 :
The escape velocity of a body from the earth is $u$. What is the escape velocity from a planet whose mass and radius are twice those of the earth?<br>
Question 25 :
A man covers $60m$ distance in one minute on the surface of earth. The distance he will cover on the surface of moon in one minute is $\left ( g_{m}= \dfrac{g_{e}}{6} \right )$<br/>
Question 26 :
While orbiting around the earth in a spaceship, an astronaut weight becomes
Question 27 :
A pendulum beats seconds on the earth. Its time period on a stationary satellite of the earth will be
Question 28 :
 The escape velocity of projection from the earth is approximately ($R = 6400 km$).
Question 29 :
An artificial satellite moving in a circular orbit around the earth has a total $(kinetic + potential)$ energy $E_{0}$, its potential energy is:
Question 31 :
The escape velocity on the surface of a planet is $V_{e}$ what would be the escape velocity on the planet having the same radius but mass 4 times that of it.
Question 33 :
For a satellite escape velocity is 11 km/s. If the satellite is launched at an angle of $60^{0}$ with the vertical, then escape velocity would be <br>
Question 34 :
When the velocity of a satellite increases, its kinetic energy increases. The satellite nowt revolves in an orbit of
Question 36 :
Assertion: Total energy is conserved in moving a satellite to higher orbit.
Reason: Sum of change in PE and KE is same in magnitude and opposite in nature
Question 37 :
An artificial satellite is revolving in a circular orbit at height of $1200 km$ above the surface of the earth. If the radius of the earth is $6400km$ and mass is $6\times 10^{24}$ kg the orbital velocity $\left ( G= 6.67\times 10^{-11} Nm^{2}/kg^{2} \right)$ is<br/>
Question 38 :
The value of $g$ at a height of $100km$ from the surface of the Earth is nearly (Radius of the Earth $=$ 6400km) ($g$ on the surface of the Earth $=$ $9.8m/s^{2}$)<br/>
Question 39 :
The escape velocity from the earth for a rocket is 11.2 km/sec. Ignoring the air resistance, the escape velocity of 10 mg grain of sand from the earth will be<br>
Question 40 :
A satellite is orbiting the earth at 17,500 MPH, a rock is released from the satellite. Identify what would happen to the rock.<br/>
Question 41 :
When a satellite falls to an orbit of smaller radius its kinetic energy :
Question 42 :
The orbital angular velocity vector of a geostationary satellite and the spin angular velocity vector of the earth are<br>
Question 43 :
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 44 :
There are two planets. The ratio of radius of the two planets is $K_r$ but ratio of acceleration due to gravity of both planets is $K_g$. What will be the ratio of their escape velocity?
Question 46 :
How much faster than its normal rate should the earth rotate about its axis so that the weight of the body at the equator becomes zero ? (Radius of the earth$= 6.4\times 10^{6}m$ and $ g = 9.8m/s^{2}$)<br>
Question 47 :
A missile is launched with a velocity less than the escape velocity.The sum of its kinetic and potential energy is :
Question 48 :
The minimum velocity of projection to go out from the earth's gravitational pull is called
Question 49 :
A pendulum clock which keeps correct time at the surface of the earth is taken into a mine, then<br>
