How many times will a wheel of radius 35cm be rotated to travel 660m?

How many Balls each of radius 2 cm can be made from a solid sphre of lead of radius 8 cm.

How many times do you breathe in a minute?

A wheel having radius 10cm is coupled by a belt to another wheel of radius 30cm. 1^(st) wheel increases its angular speed from rest at a uniform rate of 1.57 rads^(-2) . The time for 2^(nd) wheel to reach a rotational speed of 100 rev/min is....(assume that the belt does not slip)

A box is in the shape of cuboid and its dimensions are 6 cm xx 4 cm xx 2 cm . How many small cubes of each of size 2 cm can be arranged in the box.

How many times the circumference of a circle to its diameter?