I walk six miles in a straight line in a direction north of east, and I end up four miles north and several miles east. How many degrees north of east have I walked?
a. 19°
c. 60°
b. 42°
d. 71°
B
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Heisenberg's uncertainty principle is
A) noticeable only for submicroscopic particles. B) a fundamental principle in quantum mechanics. C) predominant in the atomic domain. D) all of the above E) none of the above
Two metal rods, one silver and the other copper, are both attached to a steam chamber as shown in the figure, with a temperature of 100°C, at one end, and an ice water bath, with a temperature of 0°C,
What will be an ideal response?
An airplane pilot experiences weightlessness as she passes over the top of a loop-the-loop maneuver. If her speed is 200 m/s at the time, find the radius of the loop
The most significant difference between the astronomical theories of Ptolemy and Copernicus is
A) Ptolemy's is not based on scientific evidence, while Copernicus's is. B) Ptolemy's theory does away with many of the complexities of the Copernican theory. C) Ptolemy's theory is sun-centered, whereas Copernicus's is Earth-centered. D) Ptolemy uses circular planetary orbits while Copernicus uses elliptical orbits. E) Ptolemy's theory is Earth-centered, whereas Copernicus's is sun-centered.