# Example 12-1
q = 60 deg
m1 = 200 kg
fa = m1 * grav() / sin(q)
fb = fa * cos(q)

# Example 12-3
ma = 30 kg
mb = 25 kg
y = 2.5 m
x = ma * y / mb

# Example 12-4
xm = 5 cm
x1 = 15 cm
m1 = 2 kg
x2 = 35 cm
m2 = 5 kg
fm = (x1 * m1 * grav() + x2 * m2 * grav()) / xm; N

# Example 12-5
x1 = 2.2 m
m1 = 25 kg
q = 30 deg
x2 = 1.1 m
m2 = 28 kg
fhy = (x2 / x1) * m1 * grav(); N
fty = (m1 + m2) * grav() - fhy; N
ftx = fty / tan(q)
fhx = ftx
sqrt(ftx^2 + fty^2); N

# Example 12-6
h1 = 4 m
m1 = 12 kg
w = m1 *grav()
h2 = 1.5 m
fw = w * h2  / h1
fc = [ fw, w]
mag(fc)
PolarAngle(fc); deg

# Example 12-7
h = 1.6 m
d = 0.2 cm
x = 0.25 cm
E = 2.0e11 Pa
a = pi() * d^2 / 4
f = E * x * a / h; N

# Example 12-8
d = 0.2 cm
a = pi() * d^2 / 4
Sy = 500 MPa
f = Sy * a

# Example 12-10
a = 9.5 cm * 14 cm
m1 = 25 kg
Sy = 5 Mpa
f = (1/5) * a * Sy
x1 = 1.2 m
x2 = 1.8 m
x3 = 2.4 m
x4 = 3.6 m
fl = (f * x4 - m1 * grav() * x2) / (x1 + x3); N

# Homework Problems:

TBD