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Veseljchak [2.6K]
3 years ago
6

The angle at which the light ray hits the water is equal to the angle at which light ray is reflected from the water?

Mathematics
1 answer:
Solnce55 [7]3 years ago
4 0

Answer:

yes

Step-by-step explanation:

Water reflectant areas or located more to the top of the water!

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In selecting a sulfur concrete for roadway construction in regions that experience heavy frost, it is important that the chosen
Lesechka [4]

Step-by-step explanation:

Given - In selecting a sulfur concrete for roadway construction in regions that experience heavy frost, it is important that the chosen concrete has a low value of thermal conductivity in order to minimize subsequent damage due to changing temperatures. Suppose two types of concrete, a graded aggregate and a no-fines aggregate, are being considered for a certain road. The table below summarizes data on thermal conductivity from an experiment carried out to compare the two types of concrete.

Type            ni                xi                  si

Graded       42           0.486            0.187

No-fines      42           0.359           0.158

To find - a. Formulate the above in terms of a hypothesis testing problem.

b. Give the test statistic and its reference distribution (under the null hypothesis).

c. Report the p-value of the test statistic and use it to assess the evidence that this sample provides on the scientific question of difference in mean conductivity of the two materials at the 5% level of significance.

Proof -

a.)

Hypothesis testing problem :

H0 : There is significant difference between mean conductivity for the graded concrete and mean conductivity for the no fines concrete.

H1 : There is no significant difference between mean conductivity for the graded concrete and mean conductivity for the no fines concrete.

b)

Test statistic :

Z = \frac{x_{1} - x_{2} }{\sqrt{\frac{s_{1} ^{2} }{n_{1}}  + \frac{s_{2}^{2} }{n_{2}} } }

Z = \frac{0.486 - 0.359 }{\sqrt{\frac{0.03496 }{42}  + \frac{0.02496 }{42} } }

Z = \frac{0.127 }{\sqrt{0.001468}}

Z = \frac{0.127 }{0.0377}

⇒Z(cal) = 3.3687

Z(tab) = 1.96

As Z (cal) > Z(tab)

So, we reject H0 at 5% Level of significance

p-value = 0.99962

Hence

There is significant difference in mean conductivity at the two materials.

5 0
3 years ago
How do I found the surface area of a 3 by 3 by 3 square?????
Dahasolnce [82]
3*3*3=9 perhaps?? And then it would be in Surface Area??
7 0
3 years ago
Read 2 more answers
Please help solve with working much appreciated!
Lapatulllka [165]

The right answer is Option A.

Step-by-step explanation:

Given,

Heart rate goal = I

Heart rate reserve = H

70% of H = \frac{70}{100}H = 0.7H

Resting heart rate = R

According to given statement,

70% of heart rate reserved is added to resting heart rate to calculate heart rate goal, therefore,

I = R + 0.7H

I=R+0.7H represents the given situation.

The right answer is Option A.

Keywords: linear expression, addition

Learn more about addition at:

  • brainly.com/question/10940255
  • brainly.com/question/10941043

#LearnwithBrainly

8 0
3 years ago
What is 1986÷7 please help me
sertanlavr [38]
Step 1. Set up long division 

  _______
7| 1 9 8 6

Step 2. <span>Calculate 19 ÷ 7, which is 2 with a remainder of 5.

       2
</span>  _______
7| 1 9 8 6
    1 4
_________
       5
  Step 3. Bring down 8, so that 58 is large enough to be divided by 7.

       2
  _______
7| 1 9 8 6
    1 4
_________
       5 8

Step 4. <span>Calculate 58 ÷ 7, which is 8 with a remainder of 2.

</span>       2 8
  _______
7| 1 9 8 6
    1 4
_________
       5 8
       5 6
_________
          2

Step 5. <span>Bring down 6, so that 26 is large enough to be divided by 7.

</span>      2 8
  _______
7| 1 9 8 6
    1 4
_________
       5 8
       5 6
_______
          2 6

Step 6. Calculate 26 ÷ 7, which is 3 with a remainder of 5.
   
       2 8 3
  _______
7| 1 9 8 6
    1 4
_________
       5 8
       5 6
_______
          2 6
          2 1
       ______
             5

Step 7. <span>Therefore, 1986 ÷ 7 = 283 with a remainder of 5.

823 With a remainder of 5

Done!

</span><span>Decimal Form If Needed: 283.714286</span>
6 0
3 years ago
The point (0, 0) is a solution to which of these inequalities? A. Y - 7 &lt; 2 x - 6 B. Y - 6 &lt; 2 x - 7 C. Y + 7 &lt; 2 x - 6
SCORPION-xisa [38]

Answer:

  A.  y - 7 < 2 x - 6

Step-by-step explanation:

When you put the given values into the inequalities, you get ...

  A: -7 < -6 . . . . true

  B: -6 < -7 . . . . false

  C: 7 < -6 . . . . .false

  D: 7 < 6 . . . . . false

4 0
3 years ago
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