Using the diagram above, the coefficient of kinetic friction for copper is ___ . (Your answer should be given to the nearest thousandths.) This coefficient ___ apply to all similar copper surfaces.

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when a device is used in a circuit in which the voltage is 81 v, the current flowing through the device is 3 a. what is the resistance of the device?

a. 27 ω

b. 40.5 a

c. 243 ω

d. 243 a

the correct answer is a. 27