Of the many different features of the scientific method, one feature is the most important. Without it, we should not call a field a "science." This feature is
A) the use of only those theories that are known, for certain, to be true.
B) that the results should lead to some useful technological application [for example, a useful medical treatment].
C) the use of quantitative measurements.
D) the use of mathematics.
E) the interaction between theory and observation.
E
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Chinese astronomers observed supernovae, and called them _______________ stars
Fill in the blank(s) with correct word
If the efficiency of a reversible engine is 28.%,
(a) what is its COP operated as a refrigerator? (b) what is its COP operated as a heat pump?
A 6.0-m wire with a mass of 50 g, is under tension. A transverse wave, for which the frequency is 810 Hz, the wavelength is 0.40 m, and the amplitude is 4.0 mm, is propagating on the wire
The time for a crest of this wave to travel the length of the wire is closest to A) 19 ms. B) 16 ms. C) 21 ms. D) 23 ms. E) 25 ms.