What happens when the temperature of the air cools?
a. wind develops
b. condensation forms tiny water droplets
c. it begins snowing
d. the water in the air disappears

Option B

Explanation:

Water rises into the atmosphere in the form of water vapor. Water vapor is a gas, which means that  solid or liquid water must receive enough heat energy from the Sun to change into gas.

First, the water vapor condenses. Condensation is the change of water from gas  form to liquid form. When water vapor in the atmosphere loses heat and cools down, condensation  happens. As the water vapor cools down and condenses, it attaches to small particles of dust floating  in the atmosphere, forming tiny liquid water droplets. These liquid water droplets are so small that they can float in the atmosphere. This is what forms clouds.When condensation occurs on the ground, it  forms dew. You can see dew on grass early in the morning when temperatures are cool.

this is poiselle's equation from fluid mechanic in physics. mech eng

if the person is shown to have +90n, then ans is -10n.

if the person is shown to have -90n, then ans is +10n.