What is the most accurate way to determine the distance to a nearby galaxy?
A) stellar parallax
B) radar ranging
C) Hubble's law
D) main sequence fitting
E) Cepheid variables
E
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Applications to Astronomy: The cosmic background radiation corresponds to a temperature of about
A. 1.4 K. B. 2.7 K. C. 8.0 K. D. 20 K.
What is the time constant of the circuit shown in Figure OQ28.7? Each of the five resistors has resistance R, and each of the five capacitors has capacitance C. The internal resistance of the battery is negligible
A pendulum bob on the end of a 1 m long piece of string is pulled 2 cm from its equilibrium position and it is released. In one full cycle of its motion, through what total distance does it travel?
1.2 cm 2.1/2 cm 3.4 cm 4.8 cm
How much of Earth’s land surface is still covered with wilderness?
A. 39% B. 49% C. 59% D. 79%