In what way does the Heisenberg uncertainty principle limit our ability to measure exactly?
The Heisenberg uncertainty principle is a limit on measurement accuracy that is
philosophically significant, but it is of practical importance only when dealing with
measurements made on atomic or subatomic size particles. As long as the size of the
object being measured is relatively large, this effect will be very, very small and can
be neglected. Refer to the textbook, Section 9.5, for more details.
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The terrestrial planets are made almost entirely of elements heavier than hydrogen and helium. According to modern science, where did the elements heavier than hydrogen and helium come from?
A) They were produced by stars that lived and died before our solar system was born. B) They were produced by gravity in the solar nebula as it collapsed. C) They have been present in the universe since its birth. D) They were made by chemical reactions in interstellar gas.
What would the Venus "no greenhouse" temperature be if its clouds were more transparent, giving a reflectivity the same as Earth's?
Scientific thinking is ________
A) completely different from any other type of thinking B) based on everyday ideas of observation and trial-and-error experiments C) a difficult process that only a handful of people can do well D) an ancient mode of thinking first invented in Egypt
To determine the thermal conductivity of a long, solid 2.5 cm diameter rod, one half of the rod was inserted into a furnace while the other half was projecting into air at 27°C. After steady state had been reached, the temperatures at two points 7.6 cm apart were measured and found to be 126°C and 91°C, respectively. The heat transfer coefficient over the surface of the rod exposed to the air was estimated to be 22.7 W/(m2 K). What is the thermal conductivity of the rod?
GIVEN
FIND
The thermal conductivity (k) of the rod
ASSUMPTIONS
Uniform thermal conductivity
One dimensional conduction along the rod
The rod approximates a fin of infinite length protruding out of the furnace
SKETCH
