Suppose that a mothball loses volume by evaporation at a rate proportional to its instantaneous area. If the diameter of the ball decreases from 2cm to 1cm in 3 months, how long will it take until the ball has practically gone?

Three smaller circular balls are made by melting a copper spherical ball of radius 3 cm.If the diameter of first two smaller balls be 1.5 cm and 2 cm respectively, then what will be the diameter of third ball?

A spherical snowball is melting in such a way that its volume is decreasing at a rate of 1 cm^(3)//min . The rate at which the diameter is decreaseing when the diameter is 10 cms is ..

A spherical snow ball is melting so that its volume is decreasing at the rate of 8 cc/sec. Find the rate at which its radius is decreasing when it is 2 cm.

The volume of the cylindrical trunk of a tree is proportional to the cube of its diameter and the diameter increases uniformly from year to year,prove that the rate of increase in the volume when the diameter is equal to 90cm is 25 xx the ratewhen it is 18cm.

A cylindrical pipe has inner diameter of 4cm and water flows through it at the rate of 20 metre per minute.How long would it take to fill a conical tank of radius 40cm and depth 72cm?

The diameter of a lead ball is 2.1 cm The density of the lead used is 11.34 g//c^(3) What is the weight of the ball ?

The diameter of a lead ball is 2.1 cm The density of the lead used is 11.34 g//c^(3) What is the weight of the ball ?