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Vesnalui [34]
3 years ago
15

If the circumference of a circle is Cinches, which equation represents the diameter of the circle,

Mathematics
1 answer:
igor_vitrenko [27]3 years ago
7 0

Answer:

B.

Step-by-step explanation:

It is basically just reversing the formula so B. is the correct answer

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You have 2,112 grams of a radioactive kind of mercury. How much will be left after 188 days if it's half-life is 47 days?
Anastasy [175]

Answer:

  • 132 g

Step-by-step explanation:

  • Initial amount = 2112 g
  • Time = 188 days
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188 days / 47 days = 4 periods

<u>Mercury left after 188 days:</u>

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3 years ago
What is 2s+(−4s) 2s+(−4s)?
algol13
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3 years ago
Given that curl F = 2yi – 2zj + 3k, find the surface integral of the normal component of curl F (not F) over (a) the open hemisp
Dimas [21]

Use Stokes' theorem for both parts, which equates the surface integral of the curl to the line integral along the surface's boundary.

a. The boundary of the hemisphere is the circle x^2+y^2=9 in the plane z=0, where the curl is \mathrm{curl}\vec F=2y\,\vec\imath+3\,\vec k. Green's theorem applies here, so that

\displaystyle\iint_S\mathrm{curl}\vec F\cdot\mathrm d\vec S=\int_{\partial S}\vec F\cdot\mathrm d\vec r=3\int_{x^2+y^2=9}\mathrm d\vec r

which means the value of the line integral is 3 times the area of the circle, or 27\pi.

b. The closed sphere has no boundary, so by Stokes' theorem the integral is 0.

7 0
3 years ago
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