A diagram could be a model. * A model is a representation of something in nature or a
prototype of an idea or solution important to engineering.
Models often represent phenomenon that are difficult to observe
directly. A model is often a three-dimensional, physical structure
but it does NOT have to be. A model can be an equation, diagram
or drawing. In fact, equations, diagrams and drawings are often
used to model very complex ideas in a simple way.
O True
O False

for step 7 table c on the lab "newtons law of action"   the average time it took the car to travel .25 meters   was 1.92 seconds.

the average time it took the car to travel 0.50 meters was 2.61 seconds

hope this : )

i think it's letter a.

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.