Arightward force is applied to a 6-kg object to move it across a rough surface at a constant velocity. the object encounters 25 newtons if frictional force. what would a free-body digram look like and determine the gravitational force normal force, net force, and applied (kinetic) force

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.