# Example 18-1
k = 1.38e-23 J/degK
t1 = 37 degC
kk = 1.5 * k * t1

# Example 18-2
k = 1.38e-23 J/degK
t1 = 20 degC
m1 = 5.3e-26 kg
v = sqrt(3 * k * t1 / m1)

# Example 18-4
x1 = 1
x2 = 6
x3 = 4
x4 = 2
x5 = 6
x6 = 3
x7 = 2
x8 = 5
sqrt(x1^2 + x2^2 + x3^3 + x4^2 + x5^2 + x6^2 + x7^2 + x8^2) / sqrt(8)

# Example 18-8
x = 6.02e23 / 22.4e-3 m^3
y = 3e-10 m
len = 1 / (4 * pi() * sqrt(2) * y^2 * x)

# Example 18-9
x = 0.1 m
y = 4e-5 m^2/s
t1 = 0.5 * x^2 / y

# Homework Problems:

TBD