Acircular loop made from a flexible, conducting wire is shrinking. its radius as a function of time is r = r0e-bt. the loop is perpendicular to a steady, uniform magnetic field b. find an expression for the induced emf in the loop at time t.

The diagram shows a person using a piece of gym equipment to lift weight which best describe the body in terms of simple machine

Arotating space station is said to create “artificial gravity”—a loosely-defined term used for an acceleration that would be crudely similar to gravity. the outer wall of the rotating space station would become a floor for the astronauts, and centripetal acceleration supplied by the floor would allow astronauts to exercise and maintain muscle and bone strength more naturally than in non-rotating space environments. if the space station is 200 m in diameter, what angular velocity would produce an “artificial gravity” of 9.80 m/s^{2} 2 at the rim?

This energy transformation diagram represents the energy of a skateboarder moving along a half-pipe. as she skates toward the top of the half-pipe, her original kinetic energy is converted to potential energy and friction. how much of the energy is potential?