When water of mass m and specific heat c is heated from absolute temperature T1 to absolute temperature T2, its change in entropy is
a. cm ln(T2/T1)
b. cm (T2/T1)
c. cm (T2 - T1)/T1
d. cm (T2 - T1)/T2
e. cm (T2 - T1)/(T2 + T1)
A
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Auroras are caused by
a. gases fluorescing in the atmosphere because of collisions with solar wind particles. b. the magnetosphere of Earth touching its atmosphere. c. the ozone layer being destroyed by UV light. d. a product of the atmospheric greenhouse effect. e. scattering of sunlight from particles in Earth's stratosphere.
A meter is
A. 1000 times larger than a kilometer B. 100 times longer than a kilometer C. (1 / 10) as long as a kilometer D. (1/ 100) as long as a kilometer E. (1/ 1000) as long as a kilometer
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 inductor?
A) 0.700 V B) 119 V C) 100 V D) 13.5 V E) 120 V
The principle of Occam's Razor states that
A) scientific explanations may invoke supernatural causes if no other causes are found. B) only a model that has survived repeated observational tests deserves to be called a scientific theory. C) no scientific theory, no matter how well tested, can ever be proved absolutely true. D) in explaining natural phenomena, the simplest explanation consistent with the observations is to be preferred. E) while personal biases may influence individual scientists, the process of science itself can uncover these biases.