A 10 kg bear is running to the right at 10 m/s. He crashes into another 10 kg bear running to the left at -5 m/s. They collide and stick together, and move on together at 2.5 m/s. Write at least 2 or 3 sentences explaining whether momentum was conserved in this situation.
Answers
Answer:
Total momentum is conserved
Explanation:
Conservation of Momentum
The momentum is a physical magnitude that measures the product of the object's velocity by its mass. The total momentum of a system is the sum of all its components' individual momentums. The two-bear system starts with a total moment of
When both bears stick together, the total mass is 20 kg, and the new momentum is
We have assumed both bears move to the right after the collision. In this situation, the total momentum is conserved
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Wood
Adhesives
Cooking oil
Answers
Answer: ADHESIVES
Explanation: CORRECT ON K12 QUIZ
Answers
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Because water is a very very very very very unusual substance ... It's
the only known substance whose solid form is less dense than its liquid
form near the same temperature.
In other words, water is the only known substance for which a solid lump
of it floats in a liquid glass of it.
If that were not true ... if the behavior of the density of water around its
freezing temperature were the same as the density of all other known
substances ... then life on Earth would be impossible.
Think about that for a while ! Ya gotta admire whoever it was that designed water !
because ice is less dense than liquid water
Increase, decrease, or remain the same
Answers
Density is the RATIO of mass to volume. So, if mass and volume both
increase but their ratio decreases, then the density decreases.
But if mass and volume both increase and their ratio also increases,
then the density increases.
Examples:
-- Start with a pile of some kind of substance.
Mass = 150 grams
Volume = 100 cm³
Density = (mass) / (volume) = (150 gm)/(100cm³) = 1.5 gm/cm³
-- Add 50 grams of mass. Mass = 200 gm.
Add 50 cm³ of volume. Volume = 150cm³.
Density = (mass) / (volume) = (200 gm)/(150 cm³) = 1.33 gm/cm³.
Density decreased.
-- To the original pile, add 100 grams of mass. Mass = 250 gm.
add 50 cm³ of volume. Volume= 150 cm³.
Density = (mass) / (volume) = (250 gm)/(150 cm³) = 1.67 gm/cm³.
Density increased.
-- To the original pile, add 60 grams of mass. Mass = 210 gm.
add 40 cm³ of volume. Volume = 140 cm³.
Density = (mass) / (volume) = (210 gm)/(140 cm³) = 1.5 gm/cm³.
Density no change.
Same as the original pile.
Select all that apply.
A
Water would be a gas at room temperature,
B
Water would boil at 100 degrees Celsius.
C
Water would form droplets.
D
ice would sink.
Answers
Answer:
A. Water would be a gas at room temperature, and
D. Ice would sink in water.
Explanation:
There are three types of intermolecular forces: London dispersion forces, dipole-dipole interactions, and hydrogen bonds. The relative strength of these forces depend on the size of the molecule. However, for small molecules like water (three atoms per molecule,) hydrogen bonds would be much stronger than the other two types of forces.
Without hydrogen bonds, water molecules would be held together only with dipole-dipole interactions and London dispersion forces. To get an idea of what that would be like, consider hydrochloric acid .
and water
contain about the same number of electrons. The H-Cl bond in
is polar, which allows for dipole-dipole interactions. However, only H-O, H-F, and H-N bonds allow for hydrogen bonding. As a result, there won't be any hydrogen bonding between
molecules. Without hydrogen bonding,
boils at well below
under standard pressure. It is a gas at room temperature under standard pressure. That's about the same as what water molecules would behave (physically) without any hydrogen bonds between them.
Also because of hydrogen bonding, the density of ice (solid ) is typically greater than that of water (liquid
.) When compared to water in its liquid state, there are more hydrogen bondings between molecules of water in its solid state. The hydrogen bonds hold the molecules together to form a lattice. Because of this structure due to hydrogen bondings, the molecules are farther apart than they are in the liquid states. As a result, the density of ice is typically smaller than that of water. That would likely not be the case if there was no hydrogen bondings between water molecules.
A. zoning laws
B. immigration reforms
C. international treaties
D. the amount of money in circulation
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Answer:
B
Explanation:
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