解下列力學問題

Question

A strong man holds a 500N weight as shoen.
the ends of the chain make angles of 30度and60度 to the horizontal respectively.
(a) find the tensions t^1 anf t^2 inthe chain an the tension t^3 in the wire .Neglect the weight of the chain and wire in your calculation.

Answer 1

Since you didn't give any diagram, I presume that the two chains ans wire are in a letter Y shape configuration, with the two chains formg the two arms of the Y, and the 500N weight is suspended by the wire to the bottom of the Y.

In that case, resolve T1 and T2 horizontally,
T1.cos(30) = T2.cos(60)

Reslove T1 and T2 vertically,
T1.sin(30) + T2.sin(60) = T3 = 500 N

You should be able to solve the equations for the 3 unknowns T1, T2 and T3