A block of mass 2kg rests on a rough inclined plane making an angle of 30° with the horizontal. The coefficient of static friction between the block and the plane is 0.7. What is the magnitude of the friction force on the block? (g = 9.8 ms^–2)

Two identical small bodies each of mass m and charge q are suspended from two strings each of length l from a fixed point. The whole system is taken into an orbiting artificial satellite. Find the tension in strings

A man of mass 60 kg is standing on a light weighing machine kept in a box of mass 30 kg. The box is hanging from a pulley fixed to the ceiling through a light rope the other end of which is held by the man himself. If he manages to keep the box at rest

(a) What is the weight shown by the machine?

(b) What force should the man exert on the rope to get his correct weight on the machine?

A body constrained to move in the y-direction is subjected to a force N. The work done by this force in moving the body through a distance of 10 m along y-axis ithe s?

If a bullet of mass 5 grams moving with velocity 100 ms^–1 penetrates the wooden block up to 6 cm. Then the average force imposed by the bullet on the block is