Object A is moving around another object B by the gravitational attraction. What is the acceleration of
object A, if the distance between the two objects is
5.24 x 10^3 m, and the mass of object B is 4.21 x 10^21
kg? Estimate G as 6.67 * 10^-11 N (m/kg)?

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.