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°
E
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The heavy bombardment of the early Solar System made _______________ on the Terrestrial planets
Fill in the blank(s) with correct word
Starting with a heat balance, show that the effectiveness for a counterflow arrangement is
GIVEN
Counterflow heat exchanger
FIND
Show that the effectiveness is
ASSUMPTIONS
Heat loss to surroundings in negligible
SKETCH
What do we mean by a primitive meteorite?
A) a meteorite that is essentially unchanged since it first condensed and accreted in the solar nebula almost 4.6 billion years ago B) a meteorite that was discovered by primitive people C) a type of meteorite that is made mostly of high-density metals D) a meteorite that fell to Earth at least 4 billion years ago
A 0.600-mm diameter wire stretches 0.5% of its length when it is stretched with a tension of 20 N. What is the Young's modulus of this wire?
A) 5.66 × 1010 N/m2 B) 3.54 × 109 N/m2 C) 1.41 × 1010 N/m2 D) 6.43 × 109 N/m2 E) 2.78 × 109 N/m2