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aleksandrvk [35]
3 years ago
6

A group of engineers is building a parabolic satellite dish whose shape will be formed by rotating the curve y=ax 2 about the y-

axis. If the dish is to have a 8-foot diameter and a maximum depth of 2 feet, find the value of a and the surface area (in square feet) of the dish. (Round the surface area to two decimal places.) What is the area and surface area?
Mathematics
1 answer:
Setler79 [48]3 years ago
6 0

Answer:

a = \frac{1}{2}. Surface Area = \frac{4}{3}ft^{2}. and area of the Dish = \frac{4}{3}ft^{2}+pi4^{2} = \frac{4}{3}ft^{2}+50.27=51.6ft^{2}

Step-by-step explanation:

(1) Constant. y(x) = ax^{2} that is the curve that we need to rotate around the y axis to get the parabola with diameter of 8 feet and 2 meter depth that statement is translated in mathematics as x = -4 to 4 and y = 0 to 2.

y max = 2, x max = 4 setting up a equation with a unknown gives

2=a4 and  a = \frac{1}{2}.

so we have now.

y(x) = \frac{1}{2}x^{2} (Done with solving for a Constant).

(2) Surface Area.

Setting Up surface integral.

(i) range in x = 0 to 4.

(ii) range in y = 0 to 2.

integral is.

Integral(0-2)[{integral[(0-4)\frac{1}{32}x^{2}]}]dy

Evaluating this integral gives. \frac{4}{3}ft^{2}.

and area is surface area + area of the circle with 8ft diameter.

= \frac{4}{3}ft^{2}+pi4^{2} = \frac{4}{3}ft^{2}+50.27=51.6ft^{2}...

Note the Difference between area and aurface area.!

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Mekhanik [1.2K]

Answer:

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Step-by-step explanation:

Just solve each one at a time :D

Gl on your quiz!

5 0
2 years ago
A parallelogram has sides of length 30 centimeters and 18 centimeters. One of its angles measure 58 degrees. Which is the best e
Elanso [62]

Answer:

D

Step-by-step explanation:

I'm assuming you're looking for area here.

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3 0
2 years ago
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kakasveta [241]

Answer:

Step-by-step explanation:

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6 0
3 years ago
Practice
andrew11 [14]

Computing the <u>ratio of raisins to ounces</u>, it is found that due to the <u>higher computed ratio</u>, brand B advertises the greatest ratio of raisins per ounce.

---------------------------

  • For <em>brand A</em>, there are 60 raisins in the 24-ounces box, thus the ratio is of \frac{60}{24} = 2.5, that is, 2.5 raisins per ounce.
  • For <em>brand B</em>, there are 18 raisins in the 6-ounce box, 36 in the 12-ounce, and it follows this ratio, thus \frac{36}{12} = \frac{18}{6} = 3, thus, 3 raisins per ounce.
  • For <em>brand C</em>, there are 20 raisins in the 10-ounce box, 30 in the 15-ounce, and so on, thus \frac{20}{10} = \frac{30}{15} = 2, thus, 2 raisins per ounce.
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A similar problem is given at brainly.com/question/24622075

5 0
3 years ago
Determine how many solutions each equation has without using inverse operations. Explain your reasoning for each.
GuDViN [60]

Answer:

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Step-by-step explanation:

The left side of the equation is a restatement of the right side of the equation. It is true for all values of x. There are an infinite number of solutions.

7 0
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