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In a lab to determine the Young modulus of a polymer fishing line, students hang 1β6 N and measure extension with a metre rule marked to 1 mm. The original length is 1.0 m. The largest extension they record is about 3 mm, so the percentage uncertainty is dominated by reading the extension. They can change one aspect for a repeat but must keep the material safely in the elastic region. Which change will most reduce the percentage uncertainty in the calculated Young modulus?
A data logger reads V_out from the junction of a potential divider to ground. The divider uses a fixed 10 kΞ© resistor and a light-dependent resistor (LDR). The LDRβs resistance decreases as light increases. Which arrangement will make V_out increase as the room gets brighter?
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