Melanie watched the path a baseball followed after a pitcher threw it. She noticed that the ball traveled horizontally away from the pitcher as well as downward toward the ground. What force caused the ball to accelerate in the downward direction when it was thrown?
Answers
Answer:gravity
Explanation:
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the slider is moved towards x
Answers
The rheostat is used to kind of 'spread out' the battery voltage,
you might say. It's like the whole battery voltage is spread out
along the length of the rheostat, and you can connect to any point
you want, from the negative side of the battery (Y) to the positive
side (X), and every point in between, and you get whatever the
voltage is at that particular point.
One side of the light bulb (and the voltmeter) is connected to the
negative side of the battery, and you can't change that.
But the other side of the bulb (and the voltmeter) is connected to
the slider, which can be slid anywhere between 'x' and 'y'.
When the slider is down at 'y', that's the negative side of the battery.
So both sides of the lamp are connected to the same place, there's
no voltage across the lamp, and it just sits there, cool and dark.
When the slider is all the way up at the 'x' end, that's the positive
side of the battery. So the full battery voltage is connected across
the lamp, and the lamp sparkles bright and hot.
When the slider is someplace in between, then only a part of the
full battery voltage is across the lamp (and the voltmeter).
The higher the slider is ... the closer it is to 'x' ... the more voltage
there is across the lamp. The brighter the lamp shines, and the
higher the voltmeter reads.
Answers
Diffusion is the process in which gas, through random movement of particles, tends to fill up the whole volume of the container in which it is placed. So a similar process would lead the smoke, which is in form of gas (or light particles), to fill in the whole room in which it is contained.
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.
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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.
Answers
Answers
Gravitational potential energy, relative to some level =
(mass of the object)
times
(height above the reference level)
times
(acceleration due to gravity) .