How do I approximate the muscle vivacity to hold a cargo at arms length?

There must be an answer. Will it double with double the shipment? The musculoskeletal system is basically a bunch of lever and fulcrums, with forces human being applied at the points of muscle insertion. Since the points of insertion are fixed and the location of the weight is fixed within this example, if you double the force being applied by the bulk, you must also double the force being applied by the muscle to hold the consignment in a static position. However, force and vim expenditure are not really the same article, and I don't know if they have a linear relationship to eachother. I would guess that muscular value i.e. calories burned per unit of force applied, vary based on the amount of force applied.
I dont know
No. Take moments almost a pivot point.
Or do you mean "energy" contained by terms of calories? I wouldn't know where on earth to begin to subtract metabolic loss of the muscles involved in holding up a substance and I think it largely depends on your own creative metabolism. Some people burn up vitality more easily than others.