Computes the price per kwh for a 12-volt automobile battery, Ask an Expert

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Q. Computes the price per kwh for a 12-volt automobile battery with a 50 amp-hour capacity that sells for $40. If its weight is 45-lb, what is the energy density in watt-hours per lb?

Q. A person exerts a horizontal force of F = 174-N in the test apparatus shown in the drawing. (h = 0.32 m.) Determine the horizontal force M that his flexor muscle exerts on his forearm.

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