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Evaluate force by replacing equivalent force:
In designing lifting hook, the forces acting on horizontal section through B can be determined by replacing F by equivalent force at point B and a couple. If couple is 3000 N-mm, determine force F for the figure given below.
.: Force 'F' is replaced at B, by a single force 'F' and single couple of magnitude 3000 N-mm.
Now apply the two equal and opposite force that is 'F' at point B. as shown in the figure. Now force 'F' which is act at E and upward force which is act at B makes a couple of magnitude = Force × distance
= F × 40
But 40F = 3000 i.e.
F = 75 N ........ANS
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