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

Physics & Space Science

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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

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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?

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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

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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

Physics & Space Science