Balancing a seesaw by finding another weight
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Balancing a seesaw by finding another weight

[From: ] [author: ] [Date: 12-11-20] [Hit: ]
3 = X * 1.7==>X =??Because the see-saw is not rotating, the sum of the moments must be zero.One moment is clockwise,......
a girl with a mass of 47 kg sits on one end of a seesaw that 3.0 m long and is pivoted 1.3m from the girl. if the seesaw is just balanced when a boy sits at the opposite end, what is his weight?

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47 * 1.3 = X * 1.7 ==> X = ??

Because the see-saw is not rotating, the sum of the moments must be zero.
One moment is clockwise, the other counter-clockwise so they are equal.

Remember the question asks for his weight, not his mass.

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Perform a moment balance to get 35.9 kg ~ 36 kg

To get the weight in newtons you multiply by 9.81 m/s2 and get about 352 N

mr. 30 year exp engineer pointed out how i overlooked the difference between mass (in kg) and weight (in N) :p
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