At Cornell, there used to be a narrow suspension footbridge. If you walked acros

Question

At Cornell, there used to be a narrow suspension footbridge. If you walked across it on a windless day,

it scarcely swayed at all. But if you jogged across it at just the right speed, you could get it swaying wildly

(that's why it's not there any more!). Why?

Running across the bridge at high speed, your footsteps pushed on the bridge at just the frequency needed to match the natural resonance frequency of the bridge

Running across the bridge at high speed, your footsteps simply pushed harder on the bridge, causing it to collapse

Both A and B

None of the above

Running across the bridge at high speed, your footsteps pushed on the bridge at just the frequency needed to match the natural resonance frequency of the bridge

Running across the bridge at high speed, your footsteps simply pushed harder on the bridge, causing it to collapse

Both A and B

None of the above

Explanation / Answer

A . Running across the bridge at high speed, your footsteps pushed on the bridge at just the frequency needed to match the natural resonance frequency of the bridge

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