Multiple Choice SI units question

Hi, so I'm confused about a multiple choice questions which says
"Which of the following gives the correct unit for (g²/G )?
The options are:

A) N
B) N kg^-1
C) N m
D) N m^-2

I've tried doing (N kg^-1)²/ N m² kg^-2 which simplifies to N² kg / N m²kg^-2if you expand the bracket on the numerator.
This then further simplifies to N m^-2kg^-1which isn't any of the answers...

According to the mark scheme, the correct answer is D but I can't see how the kg cancels out??
Am I going wrong somewhere? :tongue:

Thanks

Edit: Nevermind, it turns out I can't even do basic indices laws *Facepalm* lol sorry

@titfortat @Kyx (Also if anyone wants to volunteer to be tagged in future questions I post, please let me know :smile:

)

(edited 7 years ago)

Original post by jessyjellytot14

Hi, so I'm confused about a multiple choice questions which says
"Which of the following gives the correct unit for (g²/G )?
The options are:

A) N
B) N kg^-1
C) N m
D) N m^-2

I've tried doing (N kg^-1)²/ N m² kg^-2 which simplifies to N² kg / N m²kg^-2if you expand the bracket on the numerator.
This then further simplifies to N m^-2kg^-1which isn't any of the answers...

According to the mark scheme, the correct answer is D but I can't see how the kg cancels out??
Am I going wrong somewhere? :tongue:

Thanks

Edit: Nevermind, it turns out I can't even do basic indices laws *Facepalm* lol sorry

@titfortat @Kyx (Also if anyone wants to volunteer to be tagged in future questions I post, please let me know :smile:

)

It is still a good learning moment. :smile:

Reply 2

Kyx

6

Original post by jessyjellytot14

Hi, so I'm confused about a multiple choice questions which says
"Which of the following gives the correct unit for (g²/G )?
The options are:

A) N
B) N kg^-1
C) N m
D) N m^-2

I've tried doing (N kg^-1)²/ N m² kg^-2 which simplifies to N² kg / N m²kg^-2if you expand the bracket on the numerator.
This then further simplifies to N m^-2kg^-1which isn't any of the answers...

According to the mark scheme, the correct answer is D but I can't see how the kg cancels out??
Am I going wrong somewhere? :tongue:

Thanks

Edit: Nevermind, it turns out I can't even do basic indices laws *Facepalm* lol sorry

@titfortat @Kyx (Also if anyone wants to volunteer to be tagged in future questions I post, please let me know :smile:

)