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MA_775_DIABLO [31]
4 years ago
15

A magnet is useful in generating electricity because a magnetic force moves

Physics
1 answer:
stellarik [79]4 years ago
7 0

C) electrons

A magnet is useful in generating electricity because a magnetic force moves electrons

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Which event took place during the Copernican revolution, when most people started to believe in a heliocentric model of the sola
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Answer:

B

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When a potential difference of 10 V is placed across a certain solid cylindrical resistor, the current through it is 2 A. If the
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Answer:

Current would decrease 9 times.

Explanation:

Assume all others (potential difference U, resistivity ρ, and length L) are the same, only change in the diameter, we would have the following ratio

\frac{I_1}{I_2} = \frac{U/R_1}{U/R_2} = \frac{U}{U}\frac{R_2}{R_1} = \frac{\rho L/A_2}{\rho L / A_1} = \frac{\rho L}{\rho L}\frac{A_1}{A_2} = \frac{\pi d_1^2/4}{\pi d_2^2/4} = \frac{4\pi}{4\pi}\left(\frac{d_1}{d_2}\right)^2 = 3^2 = 9

I_2 = I_1/9

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7) An apple falls from the tree and the fall is 1.92 seconds. How high up was the apple?
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As we know,

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speed =distance/time

330 =distance/1.92

330/1.92 =distance

171.875 = distance

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