The diagram below shows the location of three stars in space.The light from Star 2 reaches Star 1 in 63 years. If Star 3 is 75 light years from Star 2, which of these conclusions about the stars is correct? (2 points)
Star 2 is 75 miles away from Star 3.
Star 2 is 63 kilometers away from Star 3.
Star 1 is 12 light years away from Star 3.
Star 1 is 138 light years away from Star 3.

Answers

Answer 1

Answer: Because Star 1 is 63 light years from Star 2 and Star 2 is 75 light years from Star 3 we can form a simple equation to get our answer.

75 + 63 = 138

Therefore your answer would be...

D. Star 1 is 138 light years away from Star 3.

Answer 2

Answer:

I just took th test it is letter D for sure!

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Which of the following is the best name for a compound made from calcium and bromine? (CaBr2) calcium bromide calcium dibromide monocalcium dibromide calcium bromine II

Answers

By definition, we have to:

Calcium Bromide is an inorganic salt formed by granular white crystals that responds to the formula CaBr2.

Calcium bromide has no odor, is colorless and has a bitter taste.

It is obtained by adding Hydrobromic Acid to Calcium Oxide, Calcium Carbonate or Calcium Hydroxide.

The substance that results is then subjected to a crystallization process, which involves evaporating the water.

From here, you get then:

CaBr2.

Answer:

CaBr2 = Calcium bromide.

Answer:The name of the compound made from calcium and bromine $CaBr_2$ is calcium bromide.

Explanation:

The nomenclature of ionic compounds is given by:

1. Positive is written first.

2. The negative ion is written next and a suffix is added at the end of the negative ion. The suffix written is '-ide'.

Hence, the name of $CaBr_2$ is calcium bromide.

A kite is 100m above the ground. If there are 200m of string out, what is the angle between the string and the horizontal? (Assume that the string is perfectly straight.)

Answers

Answer:

the answer is 30°

Explanation:

due to:

sin law of sines

$(sin 90)/(200) =(sin\beta )/(100)\narcsin(100(sin90)/(200) )= 30°$

Two pots are filled with boiling water. The pots are exactly the same size, but one pot is white and the other is black. Which pots cools faster?a. The black pot.
b. The white pot.
c. Neither—they both cool at the same rate.

Answers

The correct answer for the question that is being presented above is this one: "c. Neither—they both cool at the same rate."Two pots are filled with boiling water. The pots are exactly the same size, but one pot is white and the other is black. c. Neither—they both cool at the same rate.

Which of the following is not an integer?A. -52/13
B. -3.0
C. 48/6
D. 48/5

Answers

Answer:

The answer is D.

Explanation:

A integer can be positive, negative, or 0. So by simplifying all the fractions (making them into mixed numbers) we can find out that D results in a decimal, which is not a integer.

In this graph, what is the displacement of the particle in the last two seconds?of the particle in the last two seconds?

0.2 meters
2 meters
4 meters
6 meters

Answers

In this graph, what is the displacement of the particle in the last two seconds?of the particle in the last two seconds?

0.2 meters
2 meters
4 meters
6 meters
In this graph, the displacement of the particle in the last two seconds is 2 meters.

A 9.0 volt battery is connected to four resistors in a parallel circuit. The resistors have 7.0 Ω, 5.0 Ω, 4.0 Ω, and 2.0 Ω respectively. What is the total current in the circuit?

Answers

series,effective resistance =R₁+R₂+R₃...
parallel,effective resistance 1/R=1/R₁ +1/R₂ +1/R₃...

Here,effective resistance 1/R =1/7 +1/5+ 1/4+1/2
=1.092
R = 1/1.092 =0.915Ω
voltage V=9 V
current I=V/R
I=9 / 0.915
=9.83 A

parallel resistance = $(1)/(7)$ + $(1)/(5)$ + $(1)/(4)$ + $(1)/(2)$
= $(140)/(153)$

now , V= 9V
V = IR
I = $(V)/(R)$
I = $(9)/(140)$ x 153
I = 9.835714 A

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