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At the zero strain, the force is not necessarily zero due to tightening the grip! Stress-strain curve is not a good indication of initial conditions and it is hard to find the force at zero strain unless you read the machine recording at the time of experimentation! Extrapolation of stress strain curve will give you inaccurate beginning point. You can shift the stress-strain curve to give you more reasonable stress and strain values but do not extend it beyond its limit of recording

It is Hibbler book

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That’s our agreed convention to call a clockwise moment negative and counter clockwise moment positive, but in general if you use the right hand rule, a clock wise motion is towards negative Z which is the axes perpendicular to the page and counter clock wise would be towards positive z

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Dynamics-Hibbeler-14th-edition-book

It’s Hibbler

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Then you need to have other information available

What tragedy? Did you fail statics?

Hibbler

In practice, there are forces, but in theory if only external vertical forces are applied and in absence of external horizontal forces, there is no reaction forces to oppose any forces

Hibbler

if you analyse the joint A, you can notice an Y force (as well as on joint B). then, you do: Mo= 6 times YB + 900 times 4 + 600 times 8. YB= -1400 N ΣFY= YA+YB= 0 so YA= 1400N afterwards, we can find the angle of the ABE triangle: 4/3 (half of the base)= 1.333333 1.333= tg 53.13 if Fea= Ya times sin 53.13 then Fea equals 1750N you can find Feb easily after that.

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The centroid of a triangle is 2/3 from the edge of the triangle or 1/3 from the base! It can be proven but normally memorized as a rule

I don’t think I can attach them here. Which school do you go to?

Using similarities of triangles, before it was cut the bigger triangle had 200N/m, after it was cut the smaller triangle was exactly half of the bigger one, finding the ratio(i.e 200:x=6:3) , x= 100. Note that 6 and 3 are just the base distances of a bigger and smaller triangles respectively.

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Good question! For a rectangle, it is in the middle and for a triangular load, the resultant force is acting 1/3 of the base from the right angle of the triangle.

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Strange, why?

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Hibbler

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Nothing, that’s just my accent

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You are welcome! Which university do you go to?

I am glad you found it helpful! Which university do you go to?

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We are finding Y bar not Z bar, so we need to use the range of y not z.

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Due to the fact that they have two opposing directions, they can perform well in any direction, and there is no preferred direction in helical gear.

Good suggestion! I need to record videos after coffee