What is the gpe of a 200 kg hot air ballon 21,000 m above the ground?

Heena wants to measure the volume of a ball that is 24 cm across. how should she set up her equation?

Name the non metal condut electricity

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.