Three sets of waves came in contact with the object as shown in the picture below. Identify what happens to each set of waves? HELP PLS :(

In what direction does an applied force move an object

Which changes would result in a decrease in the gravitational force btween two objects? check all that apply

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?