# Example 15-2
rho = 8.9e3 kg/m^3
r = 1.05mm
mu = rho * pi() * r^2
v = 107 m/s
f = mu * v^2

# Example 15-3
B = 2 GPa
rho = 1.025e3 kg/m^3
v = sqrt(B/rho)
f = 1e5 Hz
lam = v / f
x = 100 m
t1 = 2 * x / v

# Example 15-4
x1 = 100 km
i1 = 1e6 W/m^2
x2 = 400 km
i2 = i1 * x1^2 / x2^2

# Example 15-5
f = 140 N
mu = 0.12 kg/m
v = sqrt(f / mu)
f = 250 Hz
lam = v / f; cm

# Example 15-8
h = 1.1 m
m1 = 9 g
f = 131 /s
lam = 2 * h
v = lam * f
f = m1 * v^2 / h

# Example 15-9
k = 2 / m
om = 4 Hz
a = 0.2 m
x = 0.45 m
DD = 2 * a * sin(k * x); cm

# Example 15-10
v1 = 6.5 km/s
v2 = 8 km/s
q1 = 30 deg
q2 = asin(sin(q1)* v2 / v1); deg

# Homework Problems:

TBD