Advertisements
Advertisements
Question
Which of the following quantities remain constant in a planetary motion (consider elliptical orbits) as seen from the sun?
Options
Speed
Angular speed
Kinetic Energy
Angular momentum.
Advertisements
Solution
Angular momentum.
In planetary motion, the net external torque on the planet is zero. Therefore, angular momentum will remain constant.
APPEARS IN
RELATED QUESTIONS
Choose the correct alternative:
Acceleration due to gravity increases/decreases with increasing depth. (assume the earth to be a sphere of uniform density).
Suppose the gravitational potential due to a small system is k/r2 at a distance r from it. What will be the gravitational field? Can you think of any such system? What happens if there were negative masses?
Let V and E be the gravitational potential and gravitational field at a distance r from the centre of a uniform spherical shell. Consider the following two statements :
(A) The plot of V against r is discontinuous.
(B) The plot of E against r is discontinuous.
A person sitting in a chair in a satellite feels weightless because
Four particles having masses m, 2m, 3m and 4m are placed at the four corners of a square of edge a. Find the gravitational force acting on a particle of mass m placed at the centre.
Define one Newton. How much maximum acceleration can it produce in a mass of 1 kg?
The acceleration produced by a force in an object is directly proportional to the applied _________ And inversely proportional to the _________ Of the object.
Who stated the law of gravitation?
A ball is thrown up with a speed of 4.9 ms-1.
Calculate the time it takes to reach this height.
Where will you weigh more: at the centre of the earth or at the surface of the earth?
You can change the direction in which an object is moving by___________.
Name and state the action and reaction in the following case:
Hammering a nail.
Show that gravity decreases at higher altitudes.
State Newton's universal law of gravitation. Express it with the mathematical form of force of gravitation?
State the universal law of gravitation and derive its mathematical expression.
The force of gravitation between two bodies of mass 1 kg each separated by a distance of 1 m in vacuum is ____________.
Different points in earth are at slightly different distances from the sun and hence experience different forces due to gravitation. For a rigid body, we know that if various forces act at various points in it, the resultant motion is as if a net force acts on the c.m. (centre of mass) causing translation and a net torque at the c.m. causing rotation around an axis through the c.m. For the earth-sun system (approximating the earth as a uniform density sphere).
Choose the wrong option.
We can shield a charge from electric fields by putting it inside a hollow conductor. Can we shield a body from the gravitational influence of nearby matter by putting it inside a hollow sphere or by some other means?
Write the answer of the question with reference to laws of gravitation.
Write the value of the universal gravitational constant.
