March 28, 2017

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A hiker who weighs 889 N, is strolling through the woods and crosses a small horizontal bridge. The bridge is uniform, weighs 3690 N, and rests on two concrete supports at each end. He stops one-fifth of the way along the bridge. What is the magnitude of the force that a concrete support exerts on the bridge at the near end?

  • physics - ,

    Sum moments about either end. I will do it from the far end.

    weightbridge*1/2 L+ 4/5L*889-force*L=0

    solve for force.

  • physics - ,

    what is L?

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