A wheel and axle with radii 20 cm and 5 cm, respectively, can be considered as

Two insulated charged spheres of radii 20 cm and 25 cm respectively and having equal charge q are connected by a copper wire and then they are separated

Two insulated charged spheres of radii 20 cm and 25 cm respectively and having an equal charge Q are connected by a copper wire, they are separated

A venturimeter is connected to two points in the mains where its radii are 20 cm . And 10 cm . Respectively and the levels of water column in the tube differ by 10 cms . How much water flows through the pipe per minute?

In a wheel and axle machine the radii of the wheel and axle are 0.5 m and 0.05 m,respectively . A weight of 100 kg is raised when it is hanging by a rope from the axle by applying a force of 12 kg on the circumference of the wheel . Find the mechanical advantage, velocity ratio and efficiency of this machine.

If two circles with radii 5 cm and 3 cm respectively touch internally, find the distance between their centres.

Three small lead spheres of radii 3 cm, 4 cm and 5 cm respectively, are melted into a single sphere. The diameter of the new sphere is

Two insulated charged conducting spheres of radii 20 cm and 15 cm respectively and having an equal charge of 10 C are connected by a copper wire and then they are separted. Then

Two insulated charged conducting spheres of radii 20 cm and 15 cm respectively and having an equal charge of 10 C are connected by a copper wire and then they are separted. Then

A bucket is of height 25 cm. Its top and bottom radii are 20 cm and 10 cm respectively. Its capacity in litres is