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A battery has an emf and an internal resistance . When the battery is connected to a 25 ohm resistor, the current through the battery is 0.65 A . When the battery is connected to 60 ohm resistor, the current is 0.50 A.
a) Find the battery's emf
b) Find the battery's internal resistance
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A Styrofoam box has a surface area of 0.79 m2 and a wall thickness of 2.0 cm. determine the thermal conductivity of the Styrofoam.
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