A diver of weight 800 N stands at the end of a diving board of length L = 4 m an

Question

A diver of weight 800 N stands at the end of a diving board of length L = 4 m and negligible mass (Figure 12-25). The board is fixed to two pedestals separated by distance d = 1.5 m. Fig. 12-25

(a,b) What are the magnitude and direction of the force on the board from the left pedestal? (Include the sign. Take upward to be positive.) N

(c,d) What are the magnitude and direction of the force on the board from the right pedestal? (Include the sign. Take upward to be positive.) N

(e,f) Which pedestal is being stretched and which is being compressed?

Explanation / Answer

A)
800*(4-1.5) = 2000Nm
divide by 1.5 for force on left pedestal
a=1333.33N and in downward direction.

Therefore, force from the left pedestal is 1333.33N.
B)

add forces for reaction if board is stationary
1333.33 + 800
=2133.33N and in upward direction

C)

The left pedestal is stretched and the right pedestal is compressed

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