13. A base is also known as A) A proton donor
B) An electron donor
C) proton acceptor
D)An electron acceptor

Which example has gravitational potential energy? a.a horse slowing down from a run b.an apple about to fall from a tree branch c.a bicycle being pedaled down a horizontal path d.beaker sitting on the floor

Astone weighing 1.5 kilograms is resting on a rock at a height of 20 meters above the ground. the stone rolls down 10 meters and comes to rest on a patch of moss. the gravitational potential energy of the stone on the moss is joules.

What is the coefficient of kinetic friction μk between the block and the tabletop?