Answer:
There are 5 significant figures in the number 57,030 joules.
Explanation:
In general, significant figures are all the digits in a number that are used to express precision, including all digits except:
Leading zeros (zeros that come before the first non-zero digit).
Trailing zeros (zeros that come after the last non-zero digit but before the decimal point).
Trailing zeros that are after a decimal point, if the decimal point is not at the end of the number.
In the number 57,030, all of the digits are used to express precision, so all of the digits are significant figures. The zeros between the 5 and the 7, and between the 3 and the 0, are not leading zeros or trailing zeros, so they are also significant figures. The zero after the 3 is a trailing zero, but it is after a decimal point (even though the decimal point is not written), so it is not a significant figure.
Therefore, there are 5 significant figures in the number 57,030 joules.
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