A 200 W loud speaker produces 8.9*10^ 5J of sound energy over 5 h of operation . Determine this speaker's % efficiency.

Iflow from a warmer object to a cooler object until both objects are the same temperature what am i?

Asolid cylinder and a cylindrical shell have the same mass, same radius, and turn on frictionless, horizontal axles. the cylindrical shell has light-weight spokes connecting the shell to the axle. a rope is wrapped around each cylinder and tied to blocks of equal masses that are held the same height above the ground. both blocks are released simultaneously. the ropes do not slip. which block hits the ground first? or is it a tie?

What is the increase in density of a medium due to wave travel?