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svlad2 [7]
3 years ago
15

Wire 1 has a resistance R1. Wire 2 is made of the same material, with length 1/2 as long and diameter 1/4. What is the resistanc

e ratio R2/R1?
Physics
1 answer:
hodyreva [135]3 years ago
5 0

-- reduce the length of a wire to 1/2 . . . cut the resistance in half

-- reduce the diameter to 1/4 . . . reduce the cross-section area by (1/4²) . . . increase the resistance by 16x .

-- R2 = (R1) · (1/2) · (16)  =  8 · R1

<em>-- R2 / R1  =  8</em>

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\dfrac{dz}{dt} =-5.6\ mile/h

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2 z \dfrac{dz}{dt} = 2(32+x)\dfrac{dx}{dt} + 2 y\dfrac{dy}{dt}

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20\times \dfrac{dz}{dt} =16\times (-16) +12\times 12

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\dfrac{dz}{dt} =-5.6\ mile/h

hence, the rate is the distance between them changing at the end of 1 hour is equal to \dfrac{dz}{dt} =-5.6\ mile/h

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