The numbers on the envelope suddenly turned grim. The bolt wasn't designed for a metric ton at a 5-degree dynamic tilt; it was likely rated for half that. The safety margin was evaporating with every gust of wind.
The foreman looked at Leo, then at the utility bill. "You did this with a pen and a light bill?" Back-of-the-Envelope Physics
He stopped. According to his scribbles, the cable was holding less than 10% of its capacity. It was perfectly safe. "So why is it making that sound?" he muttered. The numbers on the envelope suddenly turned grim
: The wind was gusting. The girder was oscillating about 5 degrees from the vertical. Leo scribbled a quick triangle. The centripetal force at the bottom of the swing would add to the tension. Estimate : At that height and arc, the velocity was maybe The foreman looked at Leo, then at the utility bill