Square Root Practice: Multiplying by 1000NM/kJ

[sandmanvgc]

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

Practice problem for FE

[Thread moved from the technical forums so no Homework Template is shown]

 

[berkeman]

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"

 

[berkeman]

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

 

[mjc123]

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

 

[sandmanvgc]

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

That threw me off

 

[boneh3ad]

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.