4. Light is incident on water with an angle of 62 degrees to the surface what is the refracted angle? n, sin e, na sina​

In a system, when potential energy decreases, then entropy also decreases. true false

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?

Name two kinds of practical electric pumps.