A Universe Question!An astronomer see a star that is very far away but still very bright. What can she conclude about the star?

A) The star must be very large.
B) The star must be very small.
C) The star must be moving away from Earth.
D) The star must be moving closer to Earth.

Answers

Answer 1

Answer: I'm pretty sure this is A

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Suppose nuclear physicists discovered a fission process that always produced two smaller nuclei and only one neutron. Would this eliminate the danger of meltdown in a nuclear power plant? Why or Why not- ? Explain.(Thanks to anyone who helps :)

Answers

Running that process in a power plant would not only eliminate the
danger of a core meltdown, it would also pretty much eliminate the
possibility of getting any nuclear power out of the plant.

The understanding behind your question is correct . . . Neutrons coming
out of one fission go on to get absorbed in other nuclei, and cause the
other ones to fiss. BUT . . . NOT every free neutron whizzing around in
the core material gets absorbed. Some of them enter another nucleus
and immediately get spit out. And some of them never get near another
nucleus at all. Of all the neutrons produced in one fission, only some
percentage go on to stimulate another one. So if each fission produced
only one neutron, then the whole process would completely run out of gas
in some amount if time, as the number of free neutrons dwindled and shrank.

When I bumped the table, the coffee in my cup spilled out. Newton's _____ law explains this reaction.

Answers

So we want to know which Newtons law explains the reaction when we bump into the coffee cup the coffee is spilled out. So Newtons 1st law says that a body stays in motion or it stands still until a force acts on that body. So we acted by a force on the coffee cup and the coffee continued to move even if there was no force on the coffee after we bumped the coffee cup.

it would be his first law

Which technology allows doctors to evaluate whether an athlete has broken a bone?

Answers

Answer;

X-ray scanners

Explanation;

Diagnostic imaging techniques in the field of medicine help in determination of the causes of an injury or illness and also ensures accurate diagnosis.
X-rays are examples of these diagnostic imaging techniques.

X-ray scanners are commonly used to diagnose fractured bones or joint dislocation. X-rays are the fastest and easiest way for doctors to view and assess bone fractures, injuries and joint abnormalities.
X-ray used for the bones uses small amount of ionizing radiation to generate pictures of bones in the body.

The technology that is used is an X-ray.

A motorboat travels directly east. During its trip, winds blow from directly north, directly south, and southwest. Which of the following statements is true? A. All of the winds do work on the boat. B. Only the north wind does work on the boat. C. Only the south wind does work on the boat. D. Only the southwest wind does work on the boat.

Answers

D. Only the southwest wind does work on the boat. This is because the North and South winds are opposite each other and hence cancel each other out so work is not done.

The force acting between two charged particles A and B is 5.2 × 10-5 newtons. Charges A and B are 2.4 × 10-2 meters apart. If the charge on particle A is7.2 × 10-8 coulombs, what is the charge of particle B?
(k = 9.0 × 109 newton·meters2/coulomb2)

A 2.4 × 10-2 coulombs

B 4.6 × 10-11 coulombs

C 5.2 × 10-11 coulombs

D 7.2 × 10-8 coulombs