When you observe the applications of pistons in lifting operations you're seeing
A) Pascal's principle in action.
B) how energy can be increased.
C) both of these
D) neither of these
Answer: A
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Motional Emf: As shown in the figure, a straight wire carries a steady current I. A metal bar is in contact with a pair of rails and is in upward motion with velocity of magnitude ?. The polarity of the induced emf in terminals X and Y is
A. X and Y are at the same potential. B. X is positive and Y is negative. C. Y is positive and X is negative.
Within cosmology, the critical density is
A. the density that determines whether the Universe expands forever or recollapses. B. the density of the Universe. C. the density of the most massive black hole in the Universe. D. the density of Universes in the multiverse. E. None of these choices is correct.
The focal length of a glass lens depends on
A. both the index of refraction of the glass and the intensity of the light passing through the lens. B. the curvature of the surface of the lens. C. the index of refraction of the glass. D. both the curvature of the surface of the lens and the index of refraction of the glass. E. the intensity of the light passing through the lens.
Any model of solar system formation must explain why terrestrial planets and jovian planets formed differently
Indicate whether the statement is true or false