PHYSICS HIGH SCHOOL

Dark matter may explain _____.A.unexpected orbital velocities of stars in galaxies
B.the source of energy that fuels stars
C.the expansion of the universe
D.the origin of life
E.what came before the big bang

Answers

Answer 1
Answer:

Answer: A.unexpected orbital velocities of stars in galaxies

Explanation:  

Dark Matter makes up about 80% of matter in the universe. This matter does not emit light and hence, it is called dark matter as it cannot be observed directly.

The effect of the presence of the dark matter is unexpected orbital velocities of stars in galaxies. At the center, the orbital velocities are greater than those at the edge. Had there been no dark matter, the galaxy would have flown apart.

Answer 2
Answer: Dark matter may explain unexpected orbital velocities of stars in galaxies.

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Select the correct answer. Rita is a registered dietician. What does her work entail? A. prescribing medication for clients B. cooking healthy meals for students C. demonstrating how to use gym equipment D. making recommendations for healthy eating habits

Answers

Answer:

D

Explanation:

The answer is D because:

A) Only doctors are allowed to prescribe medications.

B) Rita is not a chef/cook.

C) Rita is not a personal trainer

D) The job of a dietican is to provide reccomendations to their clients in order for them to implement a healthy lifestyle via consuming what is best for them.

Hope this helps :)

Answer:

D.) Making recommendations for healthy eating habits

Explanation: PLATO :)))

As Derrick is driving around town, he stops at a red-light. When the light turns green, he takes off and travels212m in 6.7 seconds. What is his average acceleration?

Answers

Answer:

31.6

Explanation:

velocity÷ time

212 ÷ 6.7 = 31.6m/s

A 76.5 kg cross-country skier skiing on unwaxed skis along dry snow at a constant speed of 4.00 m/s experiences a force of friction of -60.0 N.  What is the coefficient of friction between unwaxed skis and dry snow?a. 0.08
b. 0.78
c. 1.28
d. 12.5

Answers

The force of friction = (weight) x (coefficient of friction)

Skier's weight = (mass) x (gravity) = (76.5) x (9.8) = 749.7 N

Force of friction = (749.7) x (coefficient of friction) = 60.0 N

Coefficient of friction = 60 / 749.7 = 0.08  (rounded)

Choice-'A' is the closest choice offered.

You arrive in my class 45 seconds after leaving math which is 90 meters away. How fast did you travel?

Answers

Answer:

2m/s

Explanation:

speed = distance÷time

speed =90÷45=2m/s

What is the relationship among amplitude,crest,and trough?

Answers

These are characteristics of a wave. The amplitude is how high and low the waves go. Crests are high points on the wave, and troughs are low points on the wave.

Which one of the following statements about sulfuric acid is correct? A. Sulfuric acid is a known muriatic acid.
B. Sulfuric acid is a strong oxidizing agent.
C. Sulfuric acid is dangerous to living organisms.
D. Sulfuric acid has little effect on metals

Answers

The answer is C. Sulfuric Acid is dangerous to living organism

Direct contact with your skin and it will cause Chemical Burns , Direct contact with your eyes and it could cause a permanent Blindness.

This chemical also suck the water out of everything, so you can guess what will happen if it get into your body.
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