which of the following statements about black holes is false. a. Astronomers have never seen a black hole. b. A black hole sucks in matter like a vacuum cleaner. c. No light can escape from a black hole. d. All of the mass in a black hole is concentrated in a single point.

Answers

Answer 1

Answer: I love this question, because it gets at one of the greatest misconceptions about black holes.

Choice-B is false. A black hole does not suck matter in like a vacuum cleaner.

Answer 2

Answer:

Answer:

a. Astronomers have never seen a black hole.

Explanation:

A black hole is 1-Dimensional point in space-time having density is extremely large such that space-time curvature bends enough for even light cannot escape. All the mass is concentrated at this point. A black hole is formed when a very high mass star dies. It goes supernova and collapses to form a black hole. It sucks in matter like a vacuum cleaner.

Astronomers have seen a black hole by actually viewing the event horizon which is a bright disk surrounding a black hole. Recently an image of a black hole was also released.

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Two technicians are discussing hydraulics. Technician A says that if pistons of the same size are used, motion and force can be increased or decreased. Technician B says that if a small piston acts upon a larger piston, the force of the larger piston will increase, but the distance it travels will decrease. Who is correct? A. Technician B only B. Technician A only C. Both Technician A and B D. Neither Technician A nor B

Answers

the correct option is A. Only technician B is correct.

Hydraulics works on the pascal law, which states that in a direction the hydro static fluid pressure remains constant.

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Since small piston has small area compare to the large piston

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Explain how machines make work easier if they still require that the same amount of work be done.

Answers

Machines make work easier even if they still require the same amount of work to be done. We humans get tired because we do not have constant source of energy for the work to be done.Machines have a constant source of energy such as electricicity. Humans too will work at the same rate without getting tired if they are also provided with constant energy.

well machine do not feel pain of course and us humans and people do feel pain of course but if we fell pain and get hurt it slows down the process but machines on the other hand can keep going until the life source runs out. if i helped plz make mine the best

Which of these features is NOT found on the ocean floor?A. mountain
B. volcano
C. river
D. plain

Answers

The one feature that is not found on the ocean floor is a river. A river and an ocean would not be found together, even on the ocean floor.

↑ ↑ ↑ Hope this helps! :D

Which best describes the big bang theory? A. The universe is 4.6 billion years old. B. The universe is shrinking. C. Our universe is not the only universe. D. The universe is expanding.

Answers

The Big Bang Theory presents an explanation of the origin of the universe and is the most prevailing theory to date. According to the theory, the universe expanded from a state with a very high density which suddenly exploded and hurled matter to all directions. To this day, the expansion of the universe occurs and is supported by tons of evidences.

ANSWER: D. The universe is expanding.

The correct answer is letter D. The best statement that describes the big bang theory is that The Universe is Expanding. This is backed by the Doppler effect. Hope this answer helps! Good luck!

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Answers

A road with a positive cross slope is highest in the center of the road.

The roads with Cross slopes are formed to provide the drainage system so that water will run off from the surface. Due to this no water stands on the roads, especially when there is heavy rain it is very useful. It is a very important safety factor.

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