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10 months ago
Hey student.

(1) Acceleration due to gravity at the surface of planet

(2) Surface temperature of the planet.

10 months ago
Hey student.

A body will weigh more at Delhi because at higher altitudes the value of g decreases.

10 months ago
On which fundamental law of physics is keplers second law is based?

10 months ago
Which is greater the attraction of the earth for 1 kg of aluminum or aluminum or attraction of 1kg of aluminum for the earth?

10 months ago
Hey student.

In accordance with the universal law of gravitation both the forces are equal and opposite.

10 months ago

Choose the correct alternative:

(a) If the zero of potential energy is at infinity, the total energy of an orbiting satellite is negative of its kinetic/potential energy.

(b) The energy required to launch an orbiting satellite out of earth's gravitational influence is more/less than the energy required to project a stationary object at the same height (as the satellite) out of earth's influence.

10 months ago
Hey student.

(a) Kinetic energy

(b) Less

(a) Total mechanical energy of a satellite is the sum of its kinetic energy (always positive) and potential energy (may be negative). At infinity, the gravitational potential energy of the satellite is zero. As the Earth-satellite system is a bound system, the total energy of the satellite is negative.

Thus, the total energy of an orbiting satellite at infinity is equal to the negative of its kinetic energy.

(b) An orbiting satellite acquires a certain amount of energy that enables it to revolve around the Earth. This energy is provided by its orbit. It requires relatively lesser energy to move out of the influence of the Earth's gravitational field than a stationary object on the Earth's surface that initially contains no energy.

10 months ago
The mass of moon is nearly 10% of the mass of the earth.  What will be the gravitational force of the earth on the moon, in comparison to the gravitational force of the moon on the earth?

10 months ago
Hey student.

Both forces will be equal in magnitude as gravitational force is a mutual force between the two bodies.

10 months ago
Hey student.

When moving in a merry go round, our weight appears to decrease when We move down and increases when we move up, this change in Weight makes us feel giddy.

10 months ago
Name two factors which determine whether a planet would have atmosphere or not.

10 months ago
Hey student.

(i) Value of acceleration due to gravity (ii) surface temperature of planet.

10 months ago
The force of attraction due to a hollow spherical shell of uniform density on a point mass situated inside is zero, so can a body be shielded from gravitational influence?

10 months ago
Hey student.

No, the gravitational force is independent of intervening medium.

10 months ago
A satellite does not require any fuel to orbit the earth. Why?

10 months ago
Hey student.

The gravitational force between satellite and earth provides the necessary centripetal force for the satellite to orbit the earth.

10 months ago
A satellite of small mass burns during its desent and not during ascent. Why?

10 months ago
Hey student.

The speed of satellite during descent is much larger than during ascent, and so the heat produced is large.