Sam is using a torque wrench to tighten down his cylinder heads. He needs to torque the heads to 15 N m. If the wrench is 50 cm long, how much force must he use if he pulls at a 60 degree angle? a) 34.6 N
b) 44.7 N
c) 55.6 N
d) 66.7 N

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?