PHYSICS HIGH SCHOOL

What is the formula for force?a. Force = mass * velocity
b. Force = mass * acceleration
c. Force = mass / acceleration
d. Force = acceleration / mass

Answers

Answer 1

Answer: Choice 'b' is one possible way to state
Newton's second law of motion.

The other choices are meaningless.

Answer 2

Answer:

Explanation:

F=mass x acceleration

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The conversion of carbon dioxide to oxygen by plants is called _____. A. polysynthesis B. photosynthesis C. amino-acid synthesis D. amino-acid production

Answers

The conversion of carbon dioxide to oxygen by plants is called photosynthesis.

The answer would be B, photosynthesis.
Using the process of elimination, the answer is easy to find.

Polysynthesis - The act or process of combining many separate elements into a whole (Free Dictionary)

Amino-acid Synthesis - No definition, but this is clearly not the answer as amino acid has nothing to do with carbon dioxide or oxygen.

Amino-acid Production - This doesn't work for the same reason as the last one. Amino acid is irrelevant.

Therefore, the answer is photosynthesis.

The phase change in which a substance changes from a gas directly to a solid isA. condensation.
B. vaporization.
C. deposition.
D. sublimation.

Answers

Condensation is the change ofthe substance from liquid to solid phase. Example of this is the formation ofice. Vaporization is the change of substance from liquid to gas phase. Example ofthis is the boiling of water. Deposition is the change of a substance from gasto solid phase. Example of this is the formation of ice on a winter day. Sublimationis the change of a substance from solid to gas phase. Example of this is dryice. The answer is letter C.

Answer: Properties and States of Matter Practice

1. Which of the following are pure substances? Compounds

2. A substance that cannot be broken into similar substances is called a(n)... Element

3. When a physical change in a sample occurs, which of the following does NOT change? Composition

4. Which of the following will cause a decrease in gas pressure in a closed container? Lowering the temperature

5. The heat of fusion for water is the amount of energy needed for water to... Melt

6. The phase change in which a substance changes from a gas directly to a solid is... Deposition

7. Which of the following phase changes is an exothermic change? sublimation

8. Which of the following has the highest viscosity? Corn Syrup

9. In which of the substances in the figure below are the forces of attraction among the particles so weak that they can be ignored under ordinary conditions? It is the one where the particles are more apart.

Explanation:

An equinox occurs whena. neither end of Earth’s axis is tilted toward or away from the sun.
b. the north end of Earth’s axis is tilted away from the sun.
c. the north end of Earth’s axis is tilted toward the sun.
d. Earth’s axis is parallel to the sun’s rays.

Answers

Answer: The correct answer is Option a.

Explanation:

An equinox is defined as an event that occurs when Sun's rays fall on the equator at noon and at an angle of 90°.

The axis of rotation of Earth must be perpendicular to the Sun's rays for this event to occur.

If the axis is titled to some angle even, then equinox will not occur.

Hence, the correct answer is Option a.

A! Good luck on your test!

What happens to the gravitational force between two objects when their distance is changed?

Answers

If they become closer, it is increased, and if the objects become farther away is decreased.

a pelican flies at a speed of 52 km/h for 0.25 hours . how many miles does the pelican travel ? the conversion factor is 1.6 km/h = 1.0 mph

Answers

The pelican traveled 487.5 miles.

First I divided 52 by 1.6, i got 32.5, then found out how many minutes in 0.25 hour, which is 15 minute. Finally I times 32.5 and 15 together to get my finally answer.

Mechanical waves can travel through _______. vacuums only

both vacuums and mediums

mediums only