In [3]:

    

import matplotlib.pyplot as plt
from numpy import sin as sin
from numpy import cos as cos
from numpy import pi as pi
% matplotlib inline


    

In [4]:

    

ax = plt.axes()
ax.arrow(0, 0, 0.5, 0.5, head_width=0.05, head_length=0.1, fc='k', ec='k')
plt.show()


    

In [5]:

    

alpha = (90+45)*pi/180
Cx = 11.4*cos(alpha)
Cy = 11.4*sin(alpha)


beta = (60)*pi/180
Bx = 16.1*cos(beta)
By = 16.1*sin(beta)

Mx = 0.0
My = -22.0


    

In [6]:

    

fig,ax = plt.subplots()
ax.arrow(0, 0, Cx, Cy, head_width=1, head_length=2, fc='k', ec='k')
ax.arrow(0, 0, Bx, By, head_width=1, head_length=2, fc='k', ec='k')
ax.arrow(0, 0, Mx, My, head_width=1, head_length=2, fc='k', ec='k')
ax.set_xlim(-25,20)
ax.set_ylim(-25,20)
ax.text(Cx-2, Cy, r'$F_C$',verticalalignment='bottom', horizontalalignment='right', fontsize=15)
ax.text(Bx+2, By, r'$F_B$',verticalalignment='bottom', horizontalalignment='left', fontsize=15)
ax.text(Mx+2, My, r'$M$',verticalalignment='bottom', horizontalalignment='left', fontsize=15)
plt.show()


    

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