If you do not have oil in your car's engine, the parts that rub together in the engine get very hot. what does the oil do? a. it decreases the force of gravity. b. it increases the force of gravity. c. it decreases the force of friction. d. it increases the force of friction.

Jake has a nine month old son. how can he build his self esteem

This problem has been solved! see the answera non-uniform fire escape ladder is 6.0m long whenextended to the icy alley below. it is held at the top by africtionless pivot, and there is neglibible frictional force fromthe icy surface at the bottom. the ladder weighs 250n, and it'scenter of gravity is 2.0m along the ladder from the bottom. amother and child of total weight 750n are on the ladder 1.5m fromthe pivot. the ladder makes an angle θ with the horizontal.find the magnitude and direction ofa) the force exerted by the icy alley on the ladderb) the force exerted by the ladder on the pivotc) do your answers in part a and b depend on the angle?

If the speed of a particle triples ,by what factor does its kinetic energy increase?