Consider the chemical reaction involving graphite as the reactant:

2C(s) + O2(g) → 2CO(g) ΔH = -110.5kJ
According to the Law of Conservation of Energy, what would be the ΔH if the reaction were reversed?

A) -221.0 kJ
B) -55.25 kJ
C) 0 kJ
D) +110.5 kJ

An object starts from rest at point f and speeds up continuously as it moves around an oval. a. choose a point about 1/8 th of the way around the oval from point f, and label it point g. draw a vector to represent the velocity of the object at point g. b. determine the change in velocity vector   between points f and g.

All the simple machines make work easier to do by changing the or of a force. a. size; type b. work; type c. size; direction d. type; direction

Aman throws a football straight into the air. as it rises, it slows down. which type of energy is the football gaining?