Fossil evidence points to the presence of life on Earth as far back as ________ ago.
A) almost 4 billion years
B) about 2.0 billion years
C) about 545 million years
D) about 65 million years
A) almost 4 billion years
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Reactance: What rms current flows in a 60-mH inductor when 120-V rms ac at a frequency of 20 kHz is applied to it?
A. 8.0 mA B. 16 mA C. 24 mA D. 32 mA
The orbit of the planet Jupiter is ellipse with the Sun at one focus. What is located at the other focus?
a. The asteroid belt b. Earth c. Saturn d. Jupiter e. Nothing
If a material has an index of refraction of 1.461, what is the speed of light through it?
A) 2.05 × 108 m/s B) 2.34 × 108 m/s C) 1.46 × 108 m/s D) 4.38 × 108 m/s E) 5.34 × 108 m/s
Three resistors, 10 ?, 20 ?, and 30 ?, are wired in series and connected to a 120-V battery. How much current flows in the circuit?