contestada

A uniform plank of length 4.4m and weight 228N
restshorizontally on two supports, with 1.1m of the plank hanging
overthe right support. To what distance x can a person who
weighs449N walk on the overhanging part of the plank before it
begins totip.

Respuesta :

Answer:0.558 m

Explanation:

Given

weight of Plank=228 N

weight of man=449 N

Length of plank=4.4 m

let [tex]R_a[/tex] and [tex]R_b[/tex] be the reactions at A & B

and Reaction at A becomes zero when plank is about to rotate at B

Taking moment about B at that instant so that plank is just about to rotate.

[tex]228\times 1.1=449\times x[/tex]

Where x is the maximum distance that man can walk

x=0.558 m

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