PHYSICS MIDDLE SCHOOL

The method of heat transfer that plays a central role in transferring heat energy within the atmosphere and the ocean is A. convection. B. radiation. C. conduction. D. reflection.

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Answer 1
Answer: Convection is process of transferring heat from one place to the other. Warm air rises that is why heat from water will evaporate and will transfer to cooler atmosphere through this process. In convection, cooler places are replaced by warm air due because cool air sinks and warm air will replace
Answer 2
Answer: The answer is A, convection

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If a 2,300 kg car is accelerating at 16 m/s^2, what is the force it is producing?

Answers


Force = (mass) x (acceleration)

In order to acceleratethe car at that rate, a force of

                  (2,300 kg) x (16 m/s²) = 36,800 newtons
                                               (about  8,270 pounds ... 4.14 tons !)

has to be coming from somewhere ... presumably from the straining,
screaming, smoking engine under the hood.

The force it might apply to an object it runs into will depend on the
shape and composition of that object.

Two identical space probes are orbiting Jupiter. Scientists determine that one of the space probes has a larger gravitational force acting on it than the other. which of the following is the most likely reason for the difference?A. One space probe reached Jupiter before the other.
B. One space probe has more air resistance than the other.
C. Only one space probe is exerting a gravitational force on the other.
D. One space probe is closer to Jupiter than the other

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If the probes are identical, then the one that feels a larger gravitational
force is orbiting closer to Jupiter than the other one is.

If they're not identical, then the one with greater mass will feel more
gravitational force than the one with less mass, even if they're both
the same distance from Jupiter.  (We know this from the experimental
observation that fatter people weigh more, even on Earth.)

Answer:

The correct answer is D

Explanation:

Why is it important for DNA to be copied before cell division?

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If DNA is improperly copied, the cell will function differently.
This is called a mutation.
Mutated cells do not do the originally intended purpose.

two objects were lifted by a machine. one object had a mass of 2 kilograms and was lifted at the speed of 2 m/s. the other had a mass of 4 kilograms and was lifted at a rate of 3 m/s. which object had more kinetic energy while it was being lifted?"

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to find the kinetic energy KE=1/2 × mass × velocity ^2
for object 1 ke= 1/2(2)(2^2)=4 J
for object 2 ke= 1/2(4)(3^2)=18J
meaning object 2 as more kinetic energy

A place in which there is no matter is called a (n)

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By definition, a region of space that contains no matter at all is a vacuum.

Explain why the air we breathe and solids, such as steel and bronze, are solutions or homogeneous mixtures, just like salt water is ?

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Answer:

Explanation:

There are two major types of mixtures; homogeneous and heterogeneous mixtures.

Homogeneous mixture is a mixture in which its constituent particles are evenly distributed throughout the mixture. Examples are steel, bronze and air (as stated in the question). While heterogeneous mixture is a mixture in which it's constituent particles are not evenly distributed throughout the mixture. Example includes sand and water solution.

Salt water is an homogeneous mixture because the percentage of salt in a sample of salt from a particular mixture is the same in every other sample (of the same volume) of the same mixture.

From the above, we can deduce that air is an homogeneous mixture because a sample of air (in a particular area) will contain the same constituent by proportion as another sample of air (in the same area). This means that the percentage of oxygen, nitrogen, carbon dioxide, water vapour, argon and other substances in one sample of the air will be equal to the percentage of this constituents in the other sample of the air.

Same can be said about steel and bronze. For steel, each gram of the same steel will contain the same percentage of carbon and iron. And also, each gram of the same bronze will contain the same percentage of copper, tin and other metals present.

For better understanding, let's consider an heterogeneous mixture. A mixture of sand and water solution cannot have the same proportion throughout, this is because sand particles in some samples (of a particular volume) of a particular mixture will be different from sand particles in some other samples (of the same volume) of the same mixture.

Because you can't physically see the difference.
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