For an hour, he had stared at Node A. Sum of forces in X? Zero. Sum in Y? Zero. But the numbers spat out a negative reaction force that implied the left support was pulling the bridge into the ground. It made no physical sense.
"Este puente colapsó en la vida real, en 2003. Los cálculos estaban bien. La tierra se movió diferente. Cuidado con lo que asumes." solucionario analisis estructural hibbeler 8va edicion
"I don't need the why," Marcos groaned. "I need to pass the midterm. Professor Rojas throws a problem from Chapter 12 on every exam. The same one. The one with the settlement of support C." For an hour, he had stared at Node A