Ohm's Law: For the graph shown in the figure, what physical quantity does the slope of the graph represent for ohmic material?
A. current
B. resistivity
C. 1/(current)
D. power
E. 1/(resistivity)
Answer: C
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A resistor is connected to an AC power supply. On this circuit, the current
A) leads the voltage by 90°. B) lags the voltage by 90°. C) is in phase with the voltage. D) leads the voltage by 45°. E) lags the voltage by 45°.
A body of related and rigorously tested theories can be pieced together into a much larger description of nature called a hypothesis.
Indicate whether the statement is true or false.
Radioactive Decay: An air sample is contaminated with 15O, which has a half-life of 2.03 minutes. You can pass it through a long pipe to allow it to decay until it can be safely released into the atmosphere. If the speed of the gas in the pipe is 1.1 m/s, how long must the pipeline be for the sample to decay to 3.0% of its original activity?
A. 680 m B. 8.0 m C. 72 m D. 250 m
According to Newton's third law, when the Voyager probes passed Jupiter in 1979, they exerted exactly the same force on Jupiter as the giant planet did on them
Indicate whether the statement is true or false