A fish looks up through the smooth surface of the water at a bear directly above it. To the fish,
A. the bear appears to be exactly where it really is.
B. the bear appears to be further away than it really is.
C. the bear appears to be closer to the point directly above the fish than it really is.
D. the bear cannot be seen due to total internal reflection.
Answer: B
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Sgr A* is believed to be the center of the Milky Way galaxy because I. It lies in the general direction of the center of the galaxy based on observations of globular clusters in the plane of the Milky Way. II. Long wavelength dust penetrating images show it to be a region crowded with stars III. Orbits of stars around it indicate a mass several million times that of the Sun within a volume a few
light hours in size IV. Radio observations show it is a concentrated source at the center of swirling clouds of gas a. I & II only b. II & III only c. I & IV only d. II & IV only e. All of I, II, III, & IV
Special relativity predicts that the length of a moving object will be elongated in the direction of motion
Indicate whether the statement is true or false
A solid sphere, a solid cylinder, a spherical shell, and a hoop all have the same mass and radius. Each are rolling on a horizontal surface with the same center of mass speed, and then they roll up identical inclines. Which one goes the greatest distance up its incline?
a. the hoop b. the solid sphere c. the spherical shell d. the cylinder e. They all go the same distance up their inclines.
A bimetallic strip is formed from two materials that have different __________
Fill in the blank(s) with correct word