Determine if the following equations are dimensionally correct.
x = xo + vo t + (1/2) a t2 where x is the displacement at time t
xo is the displacement at time t = 0
vo is the velocity at time t = 0
a is the constant acceleration
P =  where P is pressure
r is density
g is gravitational acceleration
h is height
ln Nd/Na = - [ Vghd(r -rl)] / kT where Nd and Na are number of 
particles, V is volume, g is gravitational
acceleration, hd is distance, r and rl are
densitites, k is Boltzmann's constant with SI 
units of joules per kelvin, and T is absolute 

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