The most abundant gas in the atmosphere is
a. oxygen.
b. nitrogen.
c. water vapor.
d. carbon dioxide.
b
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Total Internal Reflection: An optic fiber is made of clear plastic with an index of refraction of 1.50. For what range of angles of incidence ? with the lateral surface of the fiber will light remain inside the plastic "guide" if it is surrounded by air?
A. 21.1° < ? < 90° B. 23.4° < ? < 90° C. 38.3° < ? < 90° D. 40.3° < ? < 90° E. 41.8° < ? < 90°
A fan blade, initially at rest, rotates with a constant acceleration of 0.025 rad/s2 . What is its angular speed at the instant it goes through an angular displacement of 10 rad?
a. 0.025 rad/s c. 0.46 rad/s b. 0.11 rad/s d. 0.71 rad/s
A telescope performs best:
A) on a high mountaintop where the air is thin and steady. B) in a valley where the air is calm. C) on a hill close to the ocean where the atmospheric turbulence is high. D) close to a valley where the seeing is poor.
Once a planet forms in a disk-like nebula around a star, its orbit is fixed and will never change
Indicate whether the statement is true or false