Aportion of a shaft where a gear is to be mounted has diameter of 50 mm. the gear transmits 335 n-m of torque. the shaft is to be made of sae 1040 cold-drawn steel. the gear is made from sae 8650 oqt 1000 steel the width of the hub of the gear mounted at this location is 45 mm. design the key. the standard key dimension for a 50-mm-diameter shaft would be 14mm '9 mm rectangular. material selection is a design decision. let's choose sae 1018 steel with s 372 mpa

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stands for electromotive force and it is measured in volts. despite its name, it is not actually the force in the sense of being a "pushing" or "pulling" (not measured in newtons).an equation that relates emf,  ℰ,  to a battery's terminal voltage, v, current, i, and internal resistance, r, is    ℰ = v + irin this case, the emf can be interpreted as a voltage—a difference in electric potential.i would not say that it would be considered an energy. if emf can be defined as the energy/work per a unit charge from a battery or other electric source, then it is not strictly energy.