The earth moving round the sun in circular orbit is acted upon by a force and hence work must be done on the earth by the force. Explain.

An electron is moving round the nucleus of a H_2 atom in a circular orbit of radius r. The coulomb force F between the two is

Obtain graphically and mathematically work done by a variable force.

What is the work done when the force on the object is zero?

A mass of 10 kg is a point A on a table. It is moved to a point B. If the line joining A and B is horizontal, what is the work done on the object by the gravitational force? Explain your answer.

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

A block moves with uniform circular motion because a cord tied to the block is anchored at the centre of a circle. Is the power of the force exerted on the block by the cord positive, negative or zero?

Derived an expression for the work done by a constant force.

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

The earth and the moon are attracted to each other by gravitational force. Does the earth attract the moon with a force that is greater or smaller or the same as the force with which the moon attracts the earth? Why?

A particle moves in a circle of radius R with a constant' speed under a centripetal force F. The work done in completing a full circle is :