Why does the moon revolve round the earth?

An artificial satellite is moving in a circular orbit of radius 42250 km. Calculate, its speed if it takes 24 hours to revolve around the earth.

Two artificial satellites, one close to the surface and other away are revolving around the earth. Which of them has larger speed?

Gravitational force on the surface of the moon is only 1/6 as strong as gravitational force on the earth. What is the weight in newtons of a 10 kg object on the moon and on the earth?

What is the work done by the force of gravity on a satellite moving round the earth? Justify your answer.

A LASER is a source- of very intense, monochromatic, and unidirectional beam of light. These properties of a laser light can be exploited to measure long distances. The distance of the Moon from the Earth has been already determined very precisely using a laser as a source 'of light. A laser light beamed at the Moon takes 2.56 s to return after reflection at the Moon’s surface. How much is the radius of the lunar orbit around the Earth?

Two satellite of masses (m_1 and m_2 (m_1 > m_2) are revolving round the earth in circular orbit of radii r_1and r_2 (r_2 > r_2) respectively. Which of the following statements is true regarding their speeds v_1 and v_2

Why does the cord of an electric heater not glow while the heating element does?