Explain what will happen of the copper pipe in the solar panel are replaced with Pvc pipes

Which units can be used to measure length or distance? check all that apply. gram meter kilometer liter inch

Awave is produced in a rope. the wave has a speed of 33 m/s and a frequency of 22 hz.

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?