You replace the motor in a crane with one that has twice the power and half the efficiencyWhich of the following quantities change?AnsweraThe maximum load that can be liftedbThe amount of energy needed to lift the load cThe frictiondthe speed of the load as it rises
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Twice the power in or twice the power out? If it's twice the power input, then the power output doesn't change from the old motor a does not change b never changes c does not change d does not change If it's twice the power output, then the next question is: where does the lost power appear? And does the torque or the speed change, or botha does change If the increase in power does include a torque increase, IE, depends on gearingb never changes c does not change, unless the efficiency loss is due to friction, in which case this does change d does change if the increase in power includes an increase in speedIE, it depends on the gearing Altogether, a very flakey question, with many possible answers.
