Complimentary colors—why does an object look a particular color to the human eye? specifically describe the copper solution and the colors that would be absorbed by that solution, and the same with the aspirin/iron solution.

When a sample absorbs light from a particular color, we recognize the object as the complementary color, if a sample absorbs red light, our eyes will see the sample appear blue-green.

Explanation:

Copper(II)  ion salts in aqueous ammonia produces a blue solution.  Copper(II) ion salts in aqueous hydrochloric acid produces a green solution.  Based on this evidence, The spectra of the two solutions will have different λmax values. if you add iron III salt to an aspirin you will see a purple color, it means that there is still some salicylic acid present and the sample is impure.

this could be newton#'s law of cooling. the cooling curve is exponential

air exerts forces on falling objects near earth’s surface.

explanation:

the term 'free falls' refer to object that are falling towards the earth, in a situation in which gravity is the only force acting on the object.

for an object in free fall, the acceleration is constant (g, the gravitational acceleration), and so the velocity of the object constantly increases.

for objects near earth's surface, there is always another force acting on the object: the resistance due to the air. this force is opposed to the direction of fall of the object, and it is proportional to the velocity of the object, so as the object falls down, this force increases up to a point when it balances the force of gravity, and the object continues its motion at constant velocity (called terminal velocity). since in this case gravity is not the only force acting on the object, we are not in a situation of free fall.