Grade 11 Physics Quiz
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A battery-powered cart is charged from a wall outlet. The charger transfers 80%80\% of the wall energy into the battery. The battery later delivers 75%75\% of its stored energy to the motor, and the motor converts 70%70\% of that energy into useful mechanical work.
What is the overall wall-to-mechanical efficiency, and how much wall energy is required to produce 252 kJ252\ \mathrm{kJ} of mechanical work?
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