4.A 0.075 kg ball in a kinetic sculpture moves at a constant speed along a
motorized vertical conveyor belt. The ball rises 1.32 m above the ground.
A constant frictional force of 0.350 N acts in the direction opposite the
conveyor belt’s motion. What is the net work done on the ball?

Will you chech and finish these for me, because i am stumped with them.

Tafari worked one summer on a ship that set weather buoys in the ocean. he watched how one of the buoys moved in the water. describe which parts of the wave would cause the buoy to bob up and down. which wave property determined how fast the buoys bobbed in the water? he observed that when the wind blew harder, the ocean waves were larger, and the buoys moved away from the ship. what effect, if any, did the waves have on how far the buoys moved? explain your answer.

An object weigh 40n in air ,weigh 20n when submerged in water,and 30n when submerged in a liquid of unknown liquid density.what is the density of unknown of liquid?