What is the normal force of a 0.0037 kg tennis ball rolling at a constant speed of 3 m/s across a desk?*

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?

Elements that have one valence electron and are very reactive are called

What are two examples of phase changes that skip a phase during transition?