Which best describes the surface of Callisto?
a. dark and dirty ice, heavily pocked with craters
b. old and dark on some portion, but cratered with a young bright grooved terrain
c. icy crust free of craters with a liquid water ocean beneath
d. covered in active sulfur-based volcanoes
e. mostly water ice mixed with methane
a
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A wave has an amplitude 20.0 cm, a wavelength 3.00 m, and the wave travels 60.0 m in 12.0 s. What is the frequency of the wave?
A) 8.33 Hz B) 250 Hz C) 0.500 Hz D) 1.67 Hz E) 150 Hz
Two parallel wires are each carrying 10 A and are separated by 4.0 m. If the currents are in opposite directions, what is the magnitude of the magnetic field halfway between them?
A. 0.0
B. 1.0
T
C. 2.0T
D. 4.0T
E. 1.4T
The ionosphere
a. reflects all EM waves. b. reflects high frequency radio waves. c. reflects low frequency radio waves. d. is responsible for the greenhouse effect. e. absorbs ultraviolet light in sunlight.
An unknown resistor is wired in series with an ammeter, and a voltmeter is placed in parallel across the resistor only. This network is then connected to a battery
If one computes the value of the resistance by dividing the voltmeter reading by the ammeter reading, the value obtained A) is less than the true resistance. B) is greater than the true resistance. C) is the true resistance. D) could be any of the given answers. It depends on other factors.