A fish under water at a depth of `20cm` can see the outer atmosphere through an aperture of radius of (critical angle of water is `45^(@)`)

A small hollow sphere having a small hole in it is immersed in water to a depth of 50cm, before any water penetrates into it. Calculate the radius of the hole, if the surface tension of water is 7.2 xx 10^(-2) Nm^(-1) .

A cylinder of radius 12cm contains water to a depth of 20cm. A spherical iron ball is dropped into the cylinder and thus the level of water is raised by 6.75 cm. Find the radius of the ball. (use\ pi=(22)/7)

Raise in water level problems : A cylinderical tub of radius 12 cm contains water to a depth of 20cm. A spherical form ball of a radius 9 cm is dropped into the tub and thus the level of water is raised by H cm. What is the value of H?

A cylinder of radius 12cm contains water to a depth of 20cm. A spherical iron ball is dropped into the cylinder and thus the level of water is raised by 6.75 cm. Find the radius of the ball. (u s epi=(22)/7)

Suppose that water is emptied from a spherical tank of radius 10 cm. If the depth of the water in the tank is 4 cm and is decreasing at the rate of 2 cm/sec, then the radius of the top surface of water is decreasing at the rate of

A small hollow sphere which has a small hole in it is immersed in water to a depth of 40 cm, before any water is penetrated into it. If the surface tensionof water si 0.073 Nm^(-1) , find the radius of the hole.

The lower end of a capillary tube is dipped into water and it is seen that the water rises through 7.5 cm in the capillary. Find the radius of the capilary. Surface tension of water =7.5xx10^-2Nm^-1 . Contact angle between water and glass =0^@. Take g=10ms^-2 .

A cylindrical tub of radius 12 cm contains water to a depth of 20 cm. A spherial iron ball is dropped into the tub and thus the level of water is raised by 6.75 cm. What is the radius of the ball?

A fish in water sees an object which is 24cm above the surface of water. The height of the object above the surface of water that will appear to the flash is (mu=4//3)

One end of a glass capillary tube with a radius r=0.05cm is immersed into water to a depth of h=2cm .Excess pressure required to blow an air bubble out of the lower end of the tube will be (S.T of water =70"dyne"//cm ).Take g=980cm//s^(2) .