Alarge block is being pushed against a smaller block such that the smaller block remains elevated while being pushed. the mass of the smaller block is =0.45 kg. it is found through repeated experimentation that the blocks need to have a minimum acceleration of =16 m/s2 in order for the smaller block to remain elevated and not slide down. what is the coefficient of static friction between the two blocks?

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?