To what depth must a rubber ball be taken in deep sea so that its volume is decreased by 0.1%. (The bulk modulus of rubber is `9.8 xx 10^8 N m^-2`, and hte density of sea water is `10^3 k m^-3`).

The average depth of Indian ocean is 3 km. Find the fractional compression of water at the bottom of the ocean, given that bulk modulus of water id 2.2 xx 10^9 Nm^-2 .

Two narrow bores of diameters 3.0 mm and 6.0 mm are joined together to form a U-tube open at both ends. If the U-tube contains water, what is the difference in its levels in the two limbs of the tube ? Surface tension of water at the temperature of the experiment is 7.3xx 10^-2 N m^-1 '. Take the angle of contact to be zero and density of water to be 1.0xx 10^3 kg m^- 3 ( g = 9.8 m s^-2 ) .

What is the density of water at a depth where pressure is 80.0 atm, given that its density at the surface is 1.03 xx 103 kg m^-3 ?

A telescope has objective lens of focal length 15m. If this telescope is used to view the moon, what is the diameter of the image of the moon formed by the objective lens? The diameter of the moon is 3.48 xx 10^6m , and the radius of lunar orbit is 3.8 xx 10^8m .

The refractive index of glass is 1.5 and that of water is 1.3.If the speed of light in water is 2.25 xx 10^8 m s^(-1) ,what is the speed of light in glass?

The number density of free electrons in a copper conductor estimated in Example 3.1 is 8.5 xx 10^28 m^-3 . How long does an electron take to drift from one end of a wire 3.0 m long to its other end? The area of cross-section of the wire is 2.0 xx 10^-6 m^2 and it is carrying a current of 3.0 A.