Question

the length of the rod and 15.2 plus minus 0.2 cm and 7.1 + - 0.2 cm find the difference in length of two rods with the limit of error

Answer 1

the difference between 2 rods is 81 .

Answer 2

$L'=8.1\pm 0.4\ cm$ is the difference in length of two rods with the limit of error

Explanation:

Given:

length of first rod with limits of error, $L_1=15.2\pm 0.2\ cm$

length of second rod with limits of error, $L_2=7.1\pm 0.2\ cm$

Now we take the difference:

$L'=(15.2\pm 0.2)-(7.1\pm 0.2)$

for maxima we take the error of same sign and add them:

$L'=8.1\pm 0.4\ cm$

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TOPIC: errors

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