Light is refracted as it crosses the interface between two different media because
A. it becomes polarized.
B. it changes speed.
C. it loses energy.
D. it changes frequency.
Answer: B
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The sky is usually the deepest blue
A) just before a rainstorm. B) during a rainstorm. C) just after a rainstorm. D) just before sunset. E) when the air is humid.
A roadway is designed for traffic moving at a speed of 94 m/s. A curved section of the roadway is a circular arc of 740 m radius. The curved section is temporarily replaced with an unbanked roadway of the same radius
The coefficient of friction of this roadway is 0.40. The maximum safe driving speed for this unbanked, curved section is closest to: A) 54 m/s B) 52 m/s C) 50 m/s D) 48 m/s E) 46 m/s
A 0.20-m radius grinding wheel starts at rest and develops an angular speed of 12.0 rad/s in 4.0 s. What is the average tangential acceleration of a point on the wheel's edge?
a. 0.45 m/s2 c. 28 m/s2 b. 0.60 m/s2 d. 14 m/s2
In an extrasolar planetary system containing a single planet, the parent star is measured to move about its center of mass every 24 years. Given this, what is the orbital period of the planet?
A) 48 years B) 12 years C) 24 years D) this cannot be determined from this observation