The 1.2-kg collar is released from rest at A and slides down the inclined fixed rod in the vertical plane. The coefficient of kinetic friction is 0.31. Calculate (a) the velocity v of the collar as it strikes the spring and (b) the maximum deflection x of the spring.

The density of a liquid could be found by using

How have the competing explanations' experiments on atoms affected the development of the atomic model?

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?