PHYSICS HIGH SCHOOL

Which force causes a wagon to speed up as it rolls down a hill?

Answers

Answer 1
Answer:

Answer: The correct answer is force of gravity.

Explanation:

Gravity is the force with which one body attracts the other body.

It goes down a hill with the increase in the kinetic energy. The kinetic energy is due to the motion of a wagon.

At the hill the gravity is lesser in comparison to the gravity on the surface of the earth.

When a wagon rolls down a hill it speeds up. Here, the earth attracts the wagon with the force of gravity. It accelerates down a hill with an acceleration due to gravity.

Answer 2
Answer: Gravity is the only one helping it.

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Scientists use models to A) increase the duration of a volcanic eruption
B) change the location of a volcanic eruption
C) predict the damages due to an earthquake
D) stop the occurrence of tsunamis due to an earthquake

Answers

D Is Thw Correct answer

what type of boundary occurs where two plates move together causing one plae to descend in the mantle beneath the other plate

Answers

This is called a subduction zone. The two plates converge, but one is forced under the other.

convergent boundary is the correct answer

Sound waves travel faster in: a. solids as compared to liquids. b. liquids as compared to gases. c. warm air as compared to cooler air. d. All of the above are correct.

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Answer:

d all of the above are correct

if a free falling rock were equipped with a speedometer, by how much would it's speed readings increase with each second IF it were on a planet where g= 20 m/s^2? would it be 60?

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accelleration(a) is changing of velocity in second.
free fall a = g
speed increase = a = g = 20 (m/s) / s

What change takes place in a wave when the frequency of the wave increases? A.fewer wavelengths pass a given point per second

B.no change occurs in the number of wavelengths that pass a given point per second

C.a greater number of wavelengths pass a given point per second

D.the number of wavelengths that pass a given point per second doubles

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The answer is C. As the frequency of the waves increases, a greater number of wavelengths pass a given point per second. From the wave formula, we see that there is an indirect relationship between frequency and the wavelength. thus, as the frequency increases the wavelength decreases resulting to a smaller distance between the waves which will show greater number of wavelengths between waves.

The pain in the leg that is referred to as "shin splints" is often caused by microtears in the periosteum and perforating fibers. These tears lead to inflammation of the periosteum. Considering the type of tissue found in the periosteum, which cells do you think would be most involved in the repair process?

Answers

Answer:

fibroblast cells

Explanation:

Periosteum is thin connective tissue layer covering the bone. It contains fibroblast cells outside and progenitor cells inside. So, the cells most involved in the repair is fibroblast cells. It is typical type of biological cell that synthesizes matrix and collagen, produces the stroma for animal tissues and plays vital role in healing wounds
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