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alex41 [277]
3 years ago
6

The diagram shows rays of light from a point source, P, that reach a detector, D, along two paths. One path is a straight line,

while the other is bent by reflection off a mirror. What is the value of b, correct to one decimal place? Assume that all the points in the diagram lie in the same plane.
5.4

4.2

3.6

2.8

Mathematics
2 answers:
tatiyna3 years ago
8 0
This can solved using the cosine law which is:
c² = a² + b² - 2ab cos θ
Using the values given from the problem
6² = b² + b² - 2bb cos 112.62
And solving for b
36 = 2b² - 2b² cos 112.62
b = 3.6

The answer is the 3rd option.
Mashcka [7]3 years ago
8 0
Hello there.

<span>The diagram shows rays of light from a point source, P, that reach a detector, D, along two paths. One path is a straight line, while the other is bent by reflection off a mirror. What is the value of b, correct to one decimal place? Assume that all the points in the diagram lie in the same plane.

</span><span>3.6 </span>
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Which relations are functions?<br><br><br><br> Choose all answers that are correct.
-Dominant- [34]
Hello!

In a function, each input has only one output. In A, three has two outputs, 4 and 5, so A is not a function.

In B, you can use something called the vertical line test to see if each x value has one y value as an output. You move an imaginary vertical line across the graph, and if it intersects with two points it is not a function. If we do this on our graph, it will not intersect two points. Therefore, B is a function.

In C, we can see that each input has one output, or there are all different inputs, so C is a function.

For D we can use that vertical line test again. It intersects both the points (-1,1) and (-1,6) so D is not a function

Our final answers are B and C.


I hope this helps!




6 0
3 years ago
Read 2 more answers
Differentiate between a fixed and movable pulley.<br>​
Tamiku [17]

Answer:

Step-by-step explanation:

A fixed pulley consists of a wheel fixed to a shaft and is used in conjunction with a belt to transfer energy to another fixed pulley. A movable pulley consists of a shell, a movable wheel and a rope. Movable pulleys are also know as block and tackle.

8 0
3 years ago
Need Help On This Question !!! (Select All That Apply)
Bas_tet [7]

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A&D

Step-by-step explanation:

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7 0
3 years ago
A spinner used in a board game is divided into 12 equally sized sectors. Seven of these sectors indicate that the player should
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Answer:

9.3 inches

Step-by-step explanation:

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Let us assume the same be x

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3 0
3 years ago
Liam invests $5,000 in an account that pays 2.5% compound interest annually. He uses the expression P(1+r)t to find the total va
Zanzabum
<span>Total = Principal × ( 1 + Rate )^years
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Total = 5,000 * (1.025)^3
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Source:
http://www.1728.org/compint.htm




6 0
3 years ago
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