Author Question: Why are troops instructed to break step when they are marching over a bridge? What will be an ... (Read 83 times)

Alainaaa8 · **on:** Jul 29, 2018

Why are troops instructed to break step when they are marching over a bridge?

What will be an ideal response?

Question 2

An ideal polarizer is placed in a beam of unpolarized light and the intensity of the transmitted light is 1. A second ideal polarizer is placed in the beam with its preferred direction rotated 40 to that of the first polarizer.

What is the intensity of the beam after it has passed through both polarizers? A)

0.77
B)

0.64
C)

0.59
D)

0.41
E)

0.30

dlook33 · **Reply #1 on:** Jul 29, 2018

Answer to Question 1

If all the soldiers march in step, a single frequency disturbance is applied to the bridge. If that frequency coincides with a natural frequency of oscillation of the bridge, a large amplitude response is possible. By breaking step, the driving force will have many random frequencies of smaller amplitude.

Answer to Question 2

C