Why do soldiers march disorderly while crossing a bridge?...
Why do soldiers march disorderly while crossing a bridge?
To prevent resonance on the bridge
To set the bridge into resonance
To make the b ridge collapse
To spread their weight evenly on the bridge
Correct answer is A
Soldiers march disorderly while crossing a bridge to prevent resonance because when soldiers march in orderly manner across a bridge, they generate a rhythmic oscillation of wave on the bridge and at a certain point, would start oscillation to the same rhythm as that of the marching steps. This oscillation would reach a maximum peak when the bridge can no longer sustain its own strength and hence collapses. So for this reasons, soldier are ordered to march disorderly while crossing a bridge.
A good calorimeter should be of ...
Longitudinal waves do not exhibit ...
From the diagram, the correct equation for the refractive index n of the medium is ...
The thermopile is a device for detecting ...
The diagram above shows a balanced metre bridge, the value of x is ...
Which of the following media allow the transmission of sound wave through them i. Air. ii. Liqui...
In order to convert a galvanometer into an ammeter ...
The expansion of solids can be considered a disadvantage in the ...