Find the change in weight percentage of a body when it is taken from equator to poles. Polar radius is 6357 km and equitorial radius is 6378 km.

Find the rate of the change of surface area of a sphere when its radius is increasing at the rate of 3/pi cm/min and its radius is 1 cm.

How does dip angle change when one moves from magnetic equator to pole?

The radius of a cylinder increases at the rate of 1 cm/s and its height decreases at the rate of 1 cm/s. Find the rate of change of its volume when the radius is 5 cm and the height is 15 cm. If the volume should not change even when the radius and height are changed, what is the relation between the radius and height?

Find the rate of change of the area of a circle with respect to its radius r when r = 3 cm

Find the rate of change of the area of a circle with respect to its radius r when r = 4 cm