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Q1. Suppose on a planet the escape velocity for a 1kg box is 100 m/s. What will be the gravitational potential energy of the body?

Solution

Q2. How many years will a planet take to complete one revolution around sun when the mean distance of sun from planet is 9 times that of sun and earth?

Solution

Q3. Which law explains the rotation of planets around the sun and the rotation of satellites around the planets?

Solution

The universal law of gravitation forms the basis of the explanation for the rotation of planets around the sun and the rotation of satellites around the planets.
Q4. Can gravitational potential energy be 0. If yes how?

Solution

Yes, gravitational potential energy can be 0 when there is an infinite separation between the two interacting bodies.
Q5. What is the angular momentum of a satellite (mass, m) with respect to the centre of orbit?

Solution

Angular momentum of satellite = L L = mvr
Q6. What will be the force of attraction between two bodies on 100 kg separated by 100 m?

Solution

Q7. Does a pendulum vibrate in an artificial satellite?

Solution

No a pendulum doesn't vibrate in an artificial satellite as there is no gravity. The value of g = 0.
Q8. Consider two bodies X and Y with mass m1 and m2 separated by distance ‘r’ meters. Suppose mass of X is doubled and mass of Y is tripled also the distance between them is doubled. Find the ratio of the gravitational force before and after changing the masses and distance.

Solution

Q9. If the radius of a planet is doubled than of earth with same average densities. What is the ratio there escape velocities.

Solution



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