Hello, I've been unable to figure this question about tension and torque out.(adsbygoogle = window.adsbygoogle || []).push({});

1.The question is: calculate the torque about the front support on the right of a diving board exerted by a 70 kg person 3.0 m from that support.

This is a crude diagram of a person on a diving board, where

D = a diver, and || means a diving board support:

____________________________________________D

||<----1.0m---->||<-----------3.0m-------------->

||- - - - - - - - - ||

||- - - - - - - - - ||

2.Relevant equations:

τ = Fd

F = ma

Fup = Fdown / Fleft = Fright

3.I get these equations:

Fup = Fdown

F1 + F2 = Mg + mg (where mg = downward force of diver, Mg = downward force of diving board at center of board)

F1 + F2 = M(9.8) + 686

τcw = τccw

Mg(1.5) + mg(3) = F2(1) (assuming F2 is the upward force for the middle support?)

Mg(1.5) + 70(9.8)(3) = F2(1)

Mg(1.5) + 2058 = F2

I assume the pivot point to be on the far left of the board. The main problem problem with both of these are that I end up with equations that have two variables. Also, I don't have M, which is the mass of the diving board - how would I figure this out?

What's wrong in my process to get the answer?

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# Homework Help: Tension/torque problem

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