posted by Adam on .
I would appreciate some help if poss I am really stuck.
I have an equation t = kpxd^2
I have to find the SI units of K
SI units of t = s
p = kg^-3
x = m
d = m
k is constant
I am really pulling my hair out on this one?
so use the units to give you the answer
s = k * (kg^-3) * (m) * (m)
s = k * (kg^-3) * (m^2)
You have to end up with seconds on the right side
k has to have units to get rid of the (kg^-3) and the (m^2) and you have to end in seconds
to get rid of (kg^-3) you need (kg^3)
to get rid of (m^2) you need (m^-2)
to end up in seconds k needs to have s in it
k ---> s(kg^3)(m^-2)
Oh! I see now, thanks very much.