PHYSICS HIGH SCHOOL

Because of convection, the warmest air in a room A. spreads out in all directions.
B. rises toward the ceiling.
C. transfers heat to the walls.
D. sinks toward the floor.

Answers

Answer 1
Answer: The correct choice is
B. rises toward the ceiling
In fact, the warmest air is also the air with least density: in warm air, the particles move faster, so the distance between them is larger, on average. Therefore, the warmest air is less dense, and because of that it tends to flow upwards (due to Archimede's principle) and it is replaced by the colder air, creating the so-called convection current.

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While researching machines and how they work, Tika finds several online sites that discuss how force and distance are related to work done by a machine.How should Tika most likely describe this relationship between force and distance to her study group?

If the input force is less than the output force, then the input distance must be greater than the output distance.
If the input force is greater than the output force, then the input distance must be greater than the output distance.
If the input force is less than the output force, then the input distance must be the same as the output distance.
If the input force is equal to the output force, then the input distance must be greater than the output distance.

Answers

The right answer for the question that is being asked and shown above is that: "If the input force is greater than the output force, then the input distance must be greater than the output distance." Tika most likely describe this relationship between force and distance to her study group is that If the input force is greater than the output force, then the input distance must be greater than the output distance.

Answer:

If the input force is less than the output force, then the input distance must be greater than the output distance.

Explanation:

I just took the test on E2020

If two swimmers compete in a race, does the faster swimmer develop more power?

Answers

Power is equal to energy per unit time. In this case, power is proportional to energy while is inversely proportional to time,on the other hand. Given the two swimmers exerts same amount of energy but the faster swimmer just does things in faster time, then the faster swimmer should develop more power from shorter time

A rigid, 2.50 L bottle contains 0.458 mol He. The pressure of the gas inside the bottle is 1.83 atm. If 0.713 mol Ar is added to the bottle and the pressure increases to 2.05 atm, what is the change in temperature of the gas mixture?The initial temperature of the gas is ______ K.

Answers

These are inert gases, so we can assume they don't react with one another. Because the two gases are also subject to all the same conditions, we can pretend there's only "one" gas, of which we have 0.458+0.713=1.171 moles total. Now we can use PV=nRT to solve for what we want.

The initial temperature and the change in temperature. You can find the initial temperature easily using PV=nRT and the information provided in the question (before Ar is added) and solving for T.

You can use PV=nRT again after Ar is added to solve for T, which will give you the final temperature. The difference between the initial and final temperatures is the change. When you're solving just be careful with the units!
 
SIDE NOTE: If you want to solve for change in temperature right away, you can do it in one step. Rearrange both PV=nRT equations to solve for T, then subtract the first (initial, i) from the second (final, f):

PiVi=niRTi --> Ti=(PiVi)/(niR)
 
PfVf=nfRTf --> Tf=(PfVf)/(nfR)

ΔT=Tf-Ti=(PfVf)/(nfR)-(PiVi)/(niR)=(V/R)(Pf/nf-Pi/ni)

In that last step I just made it easier by factoring out the V/R since V and R are the same for the initial and final conditions.

A rigid, 2.50 L bottle contains 0.458 mol He. The pressure of the gas inside the bottle is 1.83 atm. If 0.713 mol Ar is added to the bottle and the pressure increases to 2.05 atm, what is the change in temperature of the gas mixture?

The initial temperature of the gas is

wrong 137

⇒ 122 K.  correct on E.D.G

Gravity is a force of attraction between objects that is due to their weight and height between one another. a. True
b. False

Answers

The statement above is false. The statement should be: "Gravity is a force of attraction between objects that is due to their masses." Mass and weight are often interchanged. Gravitational force depends on the masses of objects, but the size of this force is what weight is. So the relationship is:

Weight = mass x gravitational constant = mass x 9.81 m/s^2

One major cause of floods isA. rapid spring snowmelt.
B. light rain over a large area.
C. a decrease in stream discharge.
D. increased capacity of stream channels.

Answers

The correct answer is A. rapid spring snowmelt. When the spring times come, sometimes there's a lot of warmth that suddenly comes, especially nowadays when there's things such as global warming. So the snow melts and large amounts of water can flood the fields that are often found at the foot of a mountain or similar things.
The answer to this question is A. Rapid Spring Snowmelt. You can find the answer in Pearson Earth Science Part 1 Textbook. "A heavy downpour or rapid snowmelt can flood canyons with a mixture of soil, rock, and water." 

Hope this helps. Have a great day! 

A child slides down a slide on the playground and her hair starts to stand on end. What happened?

Answers

It's static electricity from sliding down. Whenever a person goes fast on something, (say a roller coaster/slide/etc...) their hair gets filled with static electricity. Have a good day! :3 
possibly static electricity, I'm not so sure you should rely on my answer, but it's a guess.
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