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stiv31 [10]
3 years ago
12

Which of the following is not true of a conductor? A. It is used in electrical circuits. B. It allows easy passage of moving cha

rge. C. It is frequently made of glass or rubber. D. It is often made of metals like copper or iron.
Physics
2 answers:
Oksi-84 [34.3K]3 years ago
8 0
Three of the statements are true.  'D' is false.
Glass and rubber are excellent insulators, total duds as conductors.
yuradex [85]3 years ago
8 0

Answer:

Explanation:

glass or rubber apex ;)

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Answer:

h = 4 in

Explanation:

GIVEN DATA:

volume of tin= 16 \pi

we know that

volume of cylinder is v = \pi r^2  h

so,

16 \pi = \pi r^2 h

16 = r^2 h

r = \sqrt{\frac{16}{h}}

construct formula for surface area

S = 2\pi r^2 +  2\pi rh

S = \frac{2v}{h} + 2 \sqrt{v \pi h}

minimize the function wrt  h

S' = \frac{2v}{h^2} + \sqrt{\frac{v \pi}{h} =  0

solving for h we have

h = [\frac{4 v}{\pi}]^{1/3}

we kow v = 16 \pi   so

h = 4 in

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