Solid substances have molecules held tightly and close together
Liquid substances have molecules moving loosely
Gaseous molecules are moving completely freely
As moleclues get further apart, i.e. As a substance changes state from solid to liquid to gas, molecules gain kinetic energy and vibrate/move more. This means they gain heat energy (the averge energy a substance has) so the temperature increases
Substances exist in different states at different temperatures and different substances will exist in different states at the same temperature. This is to do with the forces between molecules and how much heat (energy) is required to break them
This would happen later at night or early in the morning.
The reason being land becomes warm and cold quicker than the water because of the heat capacity. So during the day water warms up because of sunlight but at night the land becomes a lot cooler as compared to the water which is still war. So the air over water is significantly warmer than the air over land.
Answer:
Removing some of the books reduced the mass of the box, and less force was needed to push it across the floor.
I think it's something like electrons don't attract, cuz you know the saying "Opposites attract." Cause electrons are negative... Ahaha... sorry, I don't know the answer.
Answer:
The answer is "0.91238 and 744.8"
Explanation:
In this scenario it is easier to take a person to the water-pool than to transport the people in the air, as the person's strength is increased by water upwards:
![f_b \to m \to mg =person \\\\F_B \ in\ air = v\ & air\ g \\\\](https://tex.z-dn.net/?f=f_b%20%5Cto%20m%20%5Cto%20mg%20%3Dperson%20%5C%5C%5C%5CF_B%20%5C%20in%5C%20%20air%20%3D%20v%5C%20%26%20air%5C%20%20g%20%5C%5C%5C%5C)
![=0.076 \times 1.225 \times 9.8 \\\\ =0.91238 \ N\\\\](https://tex.z-dn.net/?f=%3D0.076%20%5Ctimes%201.225%20%5Ctimes%209.8%20%5C%5C%5C%5C%20%3D0.91238%20%5C%20N%5C%5C%5C%5C)
![F_B \ in \ water = v \& water \ g \\\\](https://tex.z-dn.net/?f=F_B%20%5C%20in%20%5C%20water%20%3D%20v%20%20%5C%26%20water%20%5C%20g%20%5C%5C%5C%5C)
![=0.076 \times 1000 \times 9.8\\\\= 744.8 \ N\\](https://tex.z-dn.net/?f=%3D0.076%20%5Ctimes%201000%20%5Ctimes%209.8%5C%5C%5C%5C%3D%20744.8%20%5C%20N%5C%5C)