# Example 5.1
mu = 240 cp
v = 15 cm / 1 s
a = 2 * (8 cm) * (0.4 m)
f = 90 N
tau = f / a
h = mu * v / tau

# Example 5.2
vol = 90000 L
rho = 840 kg/m^3
w = rho * grav() * vol; kN

# Example 5.3
rho = 1.99 slug / ft^3
h = 5000 ft
del_p = rho * grav() * h; psi

# Example 5.4
FPS
vol = 55 gal
f = 35 lb
rho = 1.99 slug / ft^3
fb = rho * grav() * vol
tension = fb - f

# Example 5.5
d = 0.3 in
rho = 2.33e-3 slug / ft^3
v = 2400 ft / s
mu = 3.8e-7 slug/ft s
re_a = rho * v * d /mu

rho = 1000 kg / m^3
v = 0.5 m / s
d = 0.01 m
mu = 1.0e-3 kg/m s
re_b = rho * v * d /mu

rho = 917 kg/m^3
v = 0.5 m / s
d = 0.01 m
mu = 0.26 kg / m s
re_c = rho * v * d /mu


rho = 1.99 slug/ft^3
v = 15 knot
d = 33 ft
mu = 2.5e-5 slug/ft s
re_d = rho * v * d /mu

# Example 5.6
FPS
v = 40 mph
rate = 28 mi / gal
d = (3/8) in
q = v / rate; ft^3/ s
a = pi() * d^2 / 4
v_ave = q / a
rho = 1.32 slug/ft^3
mu = 6.1e-6 slug / ft s
re = rho * v_ave * d / mu


# Example 5.7
FPS
d = 1.68 in
v = 70 mph
rho = 2.33e-3 slug/ft^3
mu = 3.8e-7 slug / ft s
re = rho * v * d / mu
a = pi() * d^2 / 4
cd = 0.5
f = 0.5 * rho * a * v^2 * cd
cd = 0.27
f = 0.5 * rho * a * v^2 * cd

# Example 5.8
p = 200 W
cd = 0.9
a = 4 ft^2
rho = 2.33e-3 slug/ft^3
v = (2 * p / (rho * a * cd))^(1/3); mph


# Example 5.9
MKS(N, N m)
v = 0.10 m / 9 s
d = 1 mm
vol = pi() * d^3 / 6
rho = 7830 kg / m^3
w = rho * grav() * vol

rho_f = 900 kg/m^3
fb = rho_f * grav() * vol

fd = w - fb
mu = fd / (3 * pi() * d * v)

# Homework Problems:

TBD