Suppose you stand on the rim of a space station. If the radius of the station is 12,000 meters at what tangential speed must the rim of the station move in order for you to have the same weight as on the Earth? [HINT: F=mv2/r=mg]

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?

How many neutrons does plutonium -196 with an atomic number of 78.

Convection currents are caused by differences in what two things?