An object is placed 61.5 cm from a screen. Where should a converging lens of focal length 8.5 cm be placed to form an image on the screen?

Electrons in an x-ray tube are accelerated through 100 kV and directed toward a target to produce x-rays. What would be the power of the electron beam in this tube if it has a current of 12.0 mA?

The velocity ratio of a pulley is 7, and it can lift a load of 200 kgf through a vertical height of 30 m. The effort is 70 kgf downwards. What would be the efficiency of the pulley?

A manometer connected to a closed tap reads 3.5 x 105 N/m2. When the valve is opened, the reading of manometer falls to 3.0 x 105 N/m2, then what will be the velocity of flow of water?

A hand-held shopping basket 57.0cm long has a 1.71kg carton of milk at one end, and a 0.672kg box of cereal at the other end. Where should a 1.70kgcontainer of orange juice be placed so that the basket balances at its center?

A pair of coils has a mutual inductance of 2 H. If the current in primary changes from 10 A to 0 A in 0.1 s, what will be the induced emf in secondary?

A satellite is in a circular orbit very close to the surface of a spherical planet. The period of the orbit is 2.54 hours. What is density of the planet?

An insect is climbing up a 30 ft. vertical wall. Starting from the bottom it climbs up 3 ft. during the day and slips down 2 ft. at night. In how many days will it reach the top of the wall?

Liquid A and liquid B exert same amount of pressure on each other, but density of A is twice density of B. height of liquid B is 10 cm, then what would be the height of liquid A?

What should you use to lift a huge block of granite up to a certain height?

A sinusoidal wave has period 0.10s and wavelength 2.0m. What will be the wave speed?