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3 years ago

6

The BEST description of a light-year is A) the speed of light in a vacuum. B) the age of a one-year-old star. C) the distance li

ght travels in a year. D) the time it takes light to travel from Earth to the Sun.

1 answer:

Deffense [45]3 years ago

5 0

C is the answer
D is impossible
A and B are false

Hope this helps!

Please crown;)

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a length of wire is cut into five equal pieces. the five pieces are then connected in parallel, with the resulting resistance be

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The equivalent resistance of n resistors connected in parallel is given by
$\frac{1}{R_{eq}} = \frac{1}{R_1}+ \frac{1}{R_2}+...+ \frac{1}{R_n}$ (1)

In our problem, the resulting resistance of the 5 pieces connected in parallel is $R_{Eq}=2.00 \Omega$ , and since the 5 pieces are identical, their resistance R is identical, so we can rewrite (1) as
$\frac{1}{R_{Eq} }= \frac{1}{2 \Omega}= \frac{1}{R}+ \frac{1}{R} + \frac{1}{R} + \frac{1}{R} + \frac{1}{R} = \frac{5}{R}$
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So, each piece of wire has a resistance of $10 \Omega$ . Before the wire was cut, the five pieces were connected as they were in series. The equivalent resistance of a series of n resistors is given by
$R_{Eq}=R_1 + R_2 + ...+R_n$
So if we apply it at our case, we have
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therefore, the resistance of the original wire was $50 \Omega$ .

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3 years ago