The principle that states that the exact position and the velocity of an object can never be known simultaneously is called ______________ principle
Fill in the blank(s) with correct word
Heisenberg's uncertainty
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Sunspots are dark because
a. regions of the photosphere are obscured by material in the chromosphere. b. shock waves move through the photosphere. c. the sun rotates differentially. d. the strong magnetic field inhibits the currents of hot gas rising from below. e. they radiate their energy into space faster than the rest of the photosphere.
How did Edwin Hubble measure the distance to the Andromeda Galaxy?
A) He measured its parallax. B) He used Cepheid variables in the Andromeda Galaxy. C) He deduced it from its redshift. D) He used white dwarf supernovae in the Andromeda Galaxy.
The electromagnetic force is stronger than gravity. Why is it over-powered by gravity on large scales?
A) Most objects are electrically neutral. B) The electromagnetic force only works on scales of about an atomic nucleus. C) The electromagnetic force follows an inverse cube law with distance, rather than an inverse square law. D) Electrical charge is canceled out by mass.
Two forces act on a 4.00-kg object in a manner that the object has an acceleration 3.00 m/s2 in a direction 20.0° north of east. The first force is 15.00 N in a direction 10.0° west of north. What is the second force?
A) 14.6 N in a direction 28.1° south of east B) 12.9 N in a direction 28.1° south of east C) 16.2 N in a direction 30.2° south of east D) 18.8 N in a direction 41.1° south of east E) 17.5 N in a direction 37.5° south of east