Posted by **Adam** on Saturday, September 15, 2007 at 10:40am.

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?

- Science -
**manny**, Saturday, September 15, 2007 at 10:46am
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

so....

k has to have units to get rid of the (kg^-3) and the (m^2) and you have to end in seconds

so....

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

so....

k ---> s(kg^3)(m^-2)

- Science -
**Adam**, Saturday, September 15, 2007 at 12:38pm
Oh! I see now, thanks very much.

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