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## Homework Statement

Treat the atmosphere as an ideal gas with a uniform temperature of 200 K. Find the density at 20 km.

R= 260 N*m/(kg*k)

g= 3.92 m/s^2

rho(0)= 0.015 kg/m^3

## Homework Equations

P=rho*R*T

dp/dz= -rho*g

## The Attempt at a Solution

I found the pressure at ground level using P=rho*R*T

P=(0.015 kg/m^3) (260 N*m/(Kg K)) (200 K) = 780 N/m^2

I'm not sure how to proceed from here.

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