Earth has a surface area of 197 million square miles. convert this area into each of the following units.
(a.) square kilometers
(b.) square megameters
(c.) square decimeters

Explain why the aperture of the spherical mirror should be small compared to the radius of curvature of the mirror.

Frost wedging occurs when water seeps into a crack in a rock, freezes, and causes the crack in the rock to widen. t or f

The period of a pendulum varies directly as the square root of the length of the pendulum and inversely as the square root of the acceleration due to gravity. find the period when the length is 144 cm and the acceleration due to gravity is 980 cm per second squared, if the period is 7pi seconds when the length is 289 cm and the acceleration due to gravity is 980 cm per second squared.