Substituting Values in Plot

[Hotdog1]

import numpy as np
import matplotlib.pyplot as plt
plt.clf() 
u=5;
E=1000;
w = np.linspace(0, 100000,100000) 
f1= ((w*u)/(np.sqrt(1+(((w*u)/E)**2)))) 
plt.plot(w, f1)
axes = plt.gca()
axes.set_xscale('log')
axes.set_yscale('log')
axes.set_xlim([0, 10E4])            # x-axis bounds
axes.set_ylim([0, 10E4])              # y-axis bounds
plt.show()

This is how my graph should look like:
Image Graph should look