PHYSICS MIDDLE SCHOOL

A star has a size of 0.1 solar radius. How many times larger is the sun than this star?

Answers

Answer 1
Answer: -- The sun's radius is 10 times the radius of that other one.

-- The sun's surface area is 100 times the surface area of that other one.

-  The sun's volume is 1,000 times the volume of that other one.

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If a machine could be made that had 100% mechanical efficiency, it would be called an _____________________________.

Answers

It would OUTPUT exactly enough energy to pour back into its INPUT and
keep itself running.  It would be called an "Perpetual Motion" machine.

It would be completely useless, however, as anything but a curiosity
to be stared at.  If you ever tried to make it actually DO anything besides
keep itself running, it would run down and stop, because you had taken
energy out of it.

What you need in order to turn the world upside down is a machine that
has 101% mechanical efficiency ... enough energy coming out of it to
keep itself running AND have a little bit left over, that you can take and
do other things with.

Such a machine would need to create energy inside itself, which
everybody knows is not possible.

How can you make gravity smaller and bigger

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The force of gravity = GMm / r^2, where G is gravitational constant, M is mass of one object, m is mass of another object, r is distance between them.

To make gravity smaller, decrease mass or increase distance.
To make gravity bigger, increase mass or decrease distance.

You can increase the forces of gravity between you and,
let's say, a planet, in two ways.

Way #1:
Increase your mass. 
(Eat or drink more.
Fill your pockets with rocks.
Put on a heavy coat or space suit.)

Way #2:
Get closer to the center of the planet.
(That only works down to the planet's surface, but
it stops working if you go below the surface.)

To decrease the forces of gravity, do exactly the opposite:
-- lose weight
-- get farther away from the object that gravity is attracting you to .

Also, don't forget: 
The forces of gravity always work both ways. 
The less the planet pulls on you, the less you pull on the planet.
The harder the planet pulls on you, the harder you pull on the planet.

How could you increase the kinetic energy of a truck without increasing its velocity?

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Kinetic energy consists of 2 elements, mass and speed. If its velocity, that is speed, remains the same, you have to increase the mass to increase its kinetic energy without affecting velocity.
Kinetic energy of something depends on its mass and speed. 
So if you want to keep the same speed but increase its kinetic
energy, then the simple answer is that you have to increase the mass.

But it's not as simple as that.

If there's a truck cruising along the highway, and you want to increase
its kinetic energy without changing the speed, then it's true ... you'll
have to increase the mass.  You might have a helicopter swoop in low
over the truck and drop some bales of hay onto it.  That will certainly
increase the mass. But that DOESN't magically increase the kinetic
energy.  More energy has to COME from somewhere.

When the bales hit the bed of the truck and the mass suddenly increases,
if the driver doesn't want his speed to drop, he has to mash the gas pedal
a little farther, run the engine a little faster, and let the engine deliver more
energy.  THAT's where the extra kinetic energy comes from ... extracting
more chemical energy out of more gasoline.

What causes the difference between quiet and explosive eruptions?Explain.

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Well it depends on how much silica is in the magma ?

What happens to carbohydrates during cellular respiration?

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The microorganisms trap the energy in the sunlight by the process called as photosynthesis.Carbohydrates is mainly glucose, but other types of microorganisms are not able to follow this process. Therefore these organisms must rely upon prformed carbohydrates in the environment so that it obtains energy for its metabolic processes.

Final answer:

Carbohydrates, in particular, glucose, are broken down during cellular respiration to produce ATP, carbon dioxide, and water. This process consists of three stages: glycolysis, the citric acid cycle, and electron transport phosphorylation.

Explanation:

During the process of cellular respiration, carbohydrates—specifically glucose, which is a simple sugar—are broken down to produce energy in the form of ATP (adenosine triphosphate). This is a vital process carried out by all living organisms.

This complex process happens in three distinct stages: glycolysis, the citric acid cycle also referred to as the Krebs cycle, and electron transport phosphorylation also known as oxidative phosphorylation.

First, during glycolysis, one molecule of glucose gets broken down into two molecules of pyruvic acid and there is a net output of two ATP molecules. Next, the two molecules of pyruvic acid go through the citric acid cycle where they are oxidized to form carbon dioxide. Finally, during the electron transport chain, electrons are transferred through a series of proteins leading to the creation of water and producing a large amount of ATP.

Overall, the byproducts of this process are carbon dioxide and water, which are released as waste products.

Learn more about cellular respiration here:

brainly.com/question/32872970

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In static electricity what are the subatomic particles, their charges, their location in the atom

Answers

Electrons - have a negative charge and orbit the nucleus
Protons - have a positive charge and are located in the nucleus
Neutrons - have no charge and are also located in the nucleus
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