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In a lab test, a 6.0 V DC supply powers a small winch to raise a 1.2 kg mass vertically. Over 5.0 s the mass rises 2.0 m at approximately constant speed. The current from the supply is 1.8 A for the first 3.0 s and 1.2 A for the next 2.0 s. Using this information, which estimate for the overall efficiency of the lift is most reasonable?
In a lab, a mass is allowed to fall through height h, turning a small generator that charges a capacitor. For a given setup, students vary h and measure the final capacitor voltage V after the mass comes to rest. Their V^2 vs h plot is a straight line through the origin. Which change would increase the gradient of this V^2–h graph, with all other factors unchanged?
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