A beam of light in air is incident on the surface of a rectangular block of clear plastic (n = 1.49). If the velocity of the beam before it enters the plastic is 3.00 × 10^8 m/s, what is its velocity inside the block?
a. 3.00E+8 m/s
b. 1.35E+8 m/s
c. 2.01E+8 m/s
d. 2.46E+8 m/s
e. 1.53E+8 m/s
c
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Using graphical techniques estimate the temperature distribution through the earth around the electrical power line shown in Figure 2-62. Then estimate the heat transfer per unit length between the line and the ground surface.
Why do astronomers believe supermassive black holes are the source of an AGN's energy?
a. Such black holes have been found at the center of most galaxies, both active and inactive. b. Radio jets are seen from low-mass black holes plus accretion disks inside our galaxy. c. Jets and accretion disks have been observed in active galaxies. d. Black holes can produce so much energy in such a small place. e. All of the other choices are correct.
Terminal Voltage and Internal Resistance: A battery has an emf ? = 43.0 V and an internal resistance r = 8.0 ?, as shown in the figure. When the terminal voltage Vab is equal to 34.0 V, the current through the battery, including its direction, is closest to
A. 1.1 A, from b to a. B. 4.2 A, from b to a. C. 1.1 A, from a to b. D. 4.2 A, from a to b. E. 5.4 A, from b to a.
The compound methyl salicylate is commonly called ______________
Fill in the blank(s) with correct word