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Sagot :
To solve this problem, we need to follow these steps systematically:
1. Understand the given relationship:
We know that [tex]\(\sqrt{q}\)[/tex] is inversely proportional to [tex]\(r\)[/tex]. This tells us that [tex]\(\sqrt{q} = \frac{k}{r}\)[/tex], where [tex]\(k\)[/tex] is a constant of proportionality.
2. Use the initial given values to find [tex]\(k\)[/tex]:
We are told that [tex]\(\sqrt{q} = 9\)[/tex] when [tex]\(r = 4\)[/tex]. Substituting these values into the equation, we get:
[tex]\[ 9 = \frac{k}{4} \][/tex]
To solve for [tex]\(k\)[/tex], we multiply both sides of the equation by 4:
[tex]\[ k = 9 \times 4 = 36 \][/tex]
3. Determine [tex]\(r\)[/tex] when [tex]\(q=4\)[/tex]:
First, find [tex]\(\sqrt{q}\)[/tex] for the new value of [tex]\(q\)[/tex]:
[tex]\[ \sqrt{q} = \sqrt{4} = 2 \][/tex]
4. Use the constant [tex]\(k\)[/tex] to find the new [tex]\(r\)[/tex]:
We now use the relationship [tex]\(\sqrt{q} = \frac{k}{r}\)[/tex]. Plugging in the value of [tex]\(\sqrt{q} = 2\)[/tex] and [tex]\(k = 36\)[/tex], we get:
[tex]\[ 2 = \frac{36}{r} \][/tex]
Solving for [tex]\(r\)[/tex], we multiply both sides of the equation by [tex]\(r\)[/tex]:
[tex]\[ 2r = 36 \][/tex]
Dividing both sides by 2, we get:
[tex]\[ r = \frac{36}{2} = 18 \][/tex]
Therefore, the value of [tex]\(r\)[/tex] when [tex]\(q = 4\)[/tex] is [tex]\(18\)[/tex].
1. Understand the given relationship:
We know that [tex]\(\sqrt{q}\)[/tex] is inversely proportional to [tex]\(r\)[/tex]. This tells us that [tex]\(\sqrt{q} = \frac{k}{r}\)[/tex], where [tex]\(k\)[/tex] is a constant of proportionality.
2. Use the initial given values to find [tex]\(k\)[/tex]:
We are told that [tex]\(\sqrt{q} = 9\)[/tex] when [tex]\(r = 4\)[/tex]. Substituting these values into the equation, we get:
[tex]\[ 9 = \frac{k}{4} \][/tex]
To solve for [tex]\(k\)[/tex], we multiply both sides of the equation by 4:
[tex]\[ k = 9 \times 4 = 36 \][/tex]
3. Determine [tex]\(r\)[/tex] when [tex]\(q=4\)[/tex]:
First, find [tex]\(\sqrt{q}\)[/tex] for the new value of [tex]\(q\)[/tex]:
[tex]\[ \sqrt{q} = \sqrt{4} = 2 \][/tex]
4. Use the constant [tex]\(k\)[/tex] to find the new [tex]\(r\)[/tex]:
We now use the relationship [tex]\(\sqrt{q} = \frac{k}{r}\)[/tex]. Plugging in the value of [tex]\(\sqrt{q} = 2\)[/tex] and [tex]\(k = 36\)[/tex], we get:
[tex]\[ 2 = \frac{36}{r} \][/tex]
Solving for [tex]\(r\)[/tex], we multiply both sides of the equation by [tex]\(r\)[/tex]:
[tex]\[ 2r = 36 \][/tex]
Dividing both sides by 2, we get:
[tex]\[ r = \frac{36}{2} = 18 \][/tex]
Therefore, the value of [tex]\(r\)[/tex] when [tex]\(q = 4\)[/tex] is [tex]\(18\)[/tex].
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