anonymous
  • anonymous
A bridge, constructed of 11 beams of equal length L and negligible mass, supports an object of mass M (as http://masteringphysics.com/problemAsset/1010954/21/MFS_st_1_a.jpg). Throughout this problem, use g for the magnitude of the acceleration due to gravity.
Physics
  • Stacey Warren - Expert brainly.com
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chestercat
  • chestercat
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anonymous
  • anonymous
Link didn't work... Here's the pic.
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anonymous
  • anonymous
Question is: Find F_P, the vertical force that pier P exerts on the left end of the bridge.
anonymous
  • anonymous
Yes, \(F_p\) and \(F_q\) are the normal forces exerted on the truss by the pier.

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anonymous
  • anonymous
so are they both just mg? or mg/2?
anonymous
  • anonymous
nevermind, it was 2/3 mg b/c of m's placement
anonymous
  • anonymous
Indeed. You'll need to sum torques about either P or Q to determine the reaction forces at P and Q.
anonymous
  • anonymous
Yes, Fp and Fq are the normal forces exerted and the tension
anonymous
  • anonymous
Use (mv^2 + 2mv^2/3) /2

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