A given wave has a length of 1.4 m in a frequency of 2.0 hz how fast is the wave moving. a 0.7m/s
b 3.4m/s
c 2.8m/s
d 0.6m/s

How much energy must a refrigerator absorb from 225 g of water so that the temperature of the water will drop from 35°c to 5°c

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?

The particles that are found in the nucleus of an atom are