Which is the best term to describe a chemical reaction in which the reactants have less potential energy than the products? A. thermal conductor
B. thermal insulator
C. endothermic
D. exothermic

An object is dropped from a tower, 400 ft above the ground. the object's height above ground t seconds after the fall is s(t)equals400 minus 16 t squared. determine the velocity and acceleration of the object the moment it reaches the ground. the velocity of the object the moment it reaches the ground is nothing ft/s.

Which simple machine is not part of this compound machine? a. lever b. pulley c. inclined plane d. wheel and axle

Gordon is going for a run through the park, but it is cold outside. the low outside temperature could affect his personal safety.