Advertisements
Advertisements
प्रश्न
Which of the following quantities remain constant in a planetary motion (consider elliptical orbits) as seen from the sun?
विकल्प
Speed
Angular speed
Kinetic Energy
Angular momentum.
Advertisements
उत्तर
Angular momentum.
In planetary motion, the net external torque on the planet is zero. Therefore, angular momentum will remain constant.
APPEARS IN
संबंधित प्रश्न
What is the magnitude of the gravitational force between the earth and a 1 kg object on its surface? (Mass of the earth is 6 × 1024 kg and radius of the earth is 6.4 × 106 m).
Choose the correct alternative:
Acceleration due to gravity increases/decreases with increasing depth. (assume the earth to be a sphere of uniform density).
Can we apply Newton’s third law to the gravitational force ? Explain your answer.
State and explain Kepler's laws of planetary motion. Draw diagrams to illustrate these laws.
Consider a planet moving in an elliptical orbit round the sun. The work done on the planet by the gravitational force of the sun
(a) is zero in any small part of the orbit
(b) is zero in some parts of the orbit
(c) is zero in one complete revolution
(d) is zero in no part of the motion.
Two spherical balls of mass 10 kg each are placed 10 cm apart. Find the gravitational force of attraction between them.
A tunnel is dug along a chord of the earth at a perpendicular distance R/2 from the earth's centre. The wall of the tunnel may be assumed to be frictionless. Find the force exerted by the wall on a particle of mass m when it is at a distance x from the centre of the tunnel.
The law of gravitation gives the gravitational force between :
State whether the gravitational force between two masses is attractive or repulsive ?
Define one Newton. How much maximum acceleration can it produce in a mass of 1 kg?
Two equal and opposite forces acting at the same point on a stationary body. Will the body move? Give reason to explain your answer.
State Newton's law of gravitation. What is the difference between:
g and G?
Answer the following question.
What are the dimensions of the universal gravitational constant?
The value of universal gravitational constant (G) in the SI unit is ______.
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?
Give scientific reasons for the following:
Newton's gravitational law is the universal law of gravitation.
Complete the chart below.
| F(N) | M1(kg) | M2(kg) | D(m) |
| (a) | 50 | 84 | 02 |
| 16 × 109 | 1.63 × 1022 | (b) | 34 |
