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Load * Distance ., will act on the CG
Speed regulation is the percentage of speed change, generally this is only calculated on devices which are attempting to maintain a constant speed. For example, on some industry motors, they need to maintain a constant RPM. When the motor has weight bearing on it, it is called a load, and the speed may change slightly. Formula: high speed (or no load) = nL Lowest speed (or full load) = fL (nL - fL) / fL x 100 = % regulation. example: 1700 rpm no load, 1500 rpm full load. (1700 - 1500) / 1500 x 100 = 200 / 1500 x 100 = 0.1333 x 100 = roughly 13% speed regulation.
It depends upon whether or not the wall is load bearing. If load bearing, the distance between standard studs is nominally 16 inches. If not load bearing, it can be 24 inches. There may be complications at the ends of the wall and doors and windows will also increase the number of 2x4's that are needed. A good rule of thumb is to figure one per foot. So in your case that would be 16.
Mechanical advantage=load/effort
There is no formula to calculate the length of a wire. The length of a wire is determined by the distance from the power source to where the load is situated.