(a) iron has a bcc crystal structure, an atomic radius of 0.124 nm, and an atomic weight of 55.85 g/mol. compute and compare its theoretical density with the experimental value found inside the front cover. (b) explain why the theoretical density is different than the experimental density as shown in part (a).

a.) travels faster in solids because the particles are closer together.

air is a gas water is a liquid

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.