We use electrical devices leopard deuce motion, light, and sound. Which aspect of energy explains why these devices are possible?

A) Energy can’t be created
B) Energy can change from one form to another
C) Energy isn’t made of matter
D) Energy can’t be destroyed

Determine the time it takes for a satellite to orbit the earth in a circular "near-earth" orbit. the definition of "near-earth" orbit is one which is at a height above the surface of the earth which is small compared to the radius of the earth, so that you may take the acceleration due to gravity as essentially the same as that on the surface. does your result depend on the mass of the satellite?