# Square Root Practice: Multiplying by 1000NM/kJ

• sandmanvgc

#### sandmanvgc

Summary:: Why are you multiplying by 1000NM/kJ within square root?

Practice problem for FE

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Why are you multiplying by 1000NM/kJ within square root?
It's just a units conversion. Multiply by "1" whenever you want to convert from one set of units to another (and have the two sets of units in the numerator and denominator with appropriate multipliers to keep the fraction = 1):

$$1 = \frac{1000 N m}{1kJ}$$

Or in words, "1000 Newton-meters is equal to 1 kiloJoule"

etotheipi
BTW, they appear to be using both "M" and "m" for meters. Or am I misinterpreting something?

sandmanvgc
Yes, just as they use j and J for joules. Pure carelessness.

berkeman
Yes, just as they use j and J for joules. Pure carelessness.
That threw me off

berkeman
BTW, they appear to be using both "M" and "m" for meters. Or am I misinterpreting something?

View attachment 275275

They are all over the place with units. They also have [25 + 273K] as if only the second term has units. Totally bizarre.