A 120-V rms signal at 60.0 Hz is applied across a 30.0-mH inductor and a 100-? resistor. What is the rms value of the voltage across the resistor?
A) 119 V
B) 60.0 V
C) 100 V
D) 110 V
E) 0.700 V
A
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On a graph of luminosity versus color for galaxies, shown below, many galaxies form a clump known as the "blue cloud." Why are galaxies in the blue cloud blue?
A) They contain hot, young stars that indicate active star formation. B) They are moving slower than galaxies in the red cloud. C) They contain lots of dust that cause the bluish color. D) They contain cold, dying stars that are fading to black. E) They are all moving toward us, causing them to be blueshifted.
Three resistors connected in series each carry currents labeled I1, I2, and I3 . Which of the following expresses the value of the total current IT in the system made up of the three resistors in series?
a. IT = I1 + I2 + I3 c. IT = (1/I1 + 1/I2 + 1/I3) b. IT = (1/I1 + 1/I2 + 1/I3)-1 d. IT = I1 = I2 = I3
Index of Refraction: Light of wavelength 550 nm in air is found to travel at 1.96 × 108 m/s in a certain liquid. (c = 3.0 × 108 m/s)(a) What is the index of refraction of this liquid?(b) What is the frequency of the light in air?
What will be an ideal response?
The average intensity of the sunlight in Miami, Florida, is 1.04 kW/m2
For surfaces on which the light is all absorbed, what is the average value of the radiation pressure due to this sunlight in Miami? (c = 3.00 × 108 m/s, ?0 = 4? × 10-7 T ? m/A, ?0 = 8.85 × 10-12 C2/N ? m2) A) 2.28 µPa B) 1.73 µPa C) 6.93 µPa D) 3.47 µPa E) 9.78 µPa