A 500 kg roller coaster car is going over a hill, the top of which can be approximated as a circle of radius 40 meters. What is the maximum speed the car can go without loosing contact with the track?

Heat from the sun reaches earth to a. radiation b. convection c. conduction

This question is worth 54 points ! rock falls from a ledge to the ground what energy conversion occurs during this process a potential to kinetic b kinetic to potential c thermal to mechanical d chemical to mechanical

Examine the nuclear reacti why is this classified as a nuclear reaction rather than a chemical reaction? it is not balanced. a new compound is formed. a change has occurred in a nucleus. a new element has been formed.