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alexandr402 [8]
3 years ago
6

When at rest, a ruler has a length of 12.0 inches. How fast (in m/s) must the ruler fly past you in order for it to shorten to 6

.00 inches in length? Hint: to use scientific notation within Canvas, use e+ instead of 10^ (ex. 3.00×108 = 3.00e+8).
Physics
1 answer:
PIT_PIT [208]3 years ago
3 0

Answer:

2.598×10^8 m/sec

Explanation:

The length of the contraction is given by l=l_0\sqrt{1-\frac{v^2}{c^2}} here l_0 is length of the ruler at rest which is given as 12 inches

l is the length of the ruler in moving condition which is given as 6 inches c is the speed of the light and v is the velocity of the ruler.

l=l_0\sqrt{1-\frac{v^2}{c^2}}

\frac{l}{l_0}=\sqrt{1-\frac{v^2}{c^2}}

1-(\frac{l}{l_0})^2=\frac{v^2}{c^2}

1-(\frac{6}{12})^2=\frac{v^2}{c^2}

0.866=\frac{v}{c}

v=0.866\times 3\times 10^8=2.598\times 10^8 m/sec

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