What types of media can S-waves travel through

In a voltaic cell, electrons flow from the (positive/negative) to the (positive/negative) terminal.

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?

Wavelength of 125 meters is moving at a speed of 10 m/s. what is it's frequency?