500 persons took dip in a rectangular tank which is 80 m long and 50 m broad. What is the rise in the level of water in the tank. If the average displacement of water by a person is `0.04 m^3`?

A cuboidal water tank is 6 m long 5 m wide and 4.5 m deep. How many litre of water can it hold ?

A person is standing on a railway station which is 120 m long . He observes that the trains crosses the station in 30 sec. but himself in 6 seconds. Find the length of the train.

The bottom of a rectangular swimming tank is 25 m by 40m. Water is pumped into the tank at the rate of 500 cubic metres per minute. Find the rate at which the level of water in the tank is rising.

A water tank has the shape of an inverted right circular cone with its axis vertical and vertex lowermost. Its semi-vertical angle is tan^-1(0.5) . Water is poured into it at a constant rate of 5 m^3/h . Find the rate at which the level of the water is rising at the instant when the depth of water in the tank is 4 m .

A person crosses a 600 m long street in 5 second. What is his speed ?

A rectangular tank is 80 m long and 25 m braod water flows into it through a pipe whose cross section is 25 cm^2 , at the rate of 16 km per hour. How much the level of the water rises in the tank in 45 minutes.

A water tank has the shape of an inverted right circular cone, whose semi-vertical angle is tan ^(-1)((1)/(2)) . Water is poured into it at a constant rate of 5 cu m/min. Then, the rate (in m/min) at which the level of water is rising at the instant when the depth of water in the tank is 10 m. Water is a natural resource. What is the importance of water in our daily life?

A fish swims in a glass tank.A person,whose eye is above the level of water ,sees two fishes.Draw a ray diagram to illustrate this.

Find the amount of water displaced by a solid spherical ball of diameter 0.21 m.