The Ptolemaic model probably persisted for all these reasons EXCEPT:
A) it had the authority of Aristotle behind it.
B) it was consistent with the doctrines of the Catholic Church.
C) it used perfect circles, which appealed to geometry.
D) it accounted well for Galileo's observations of the phase cycle of Venus.
E) it explain why stellar parallax was not observed by the Greeks.
D
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What is the uncorrected near point of a farsighted person who can comfortably read a newspaper held 25 cm from his eyes when he wears +3.33-diopter contact lenses?
A) 1.5 m B) 0.50 m C) 1.9 m D) 0.75 m E) 0.60 m
The image of an object beneath the surface of a medium of refractive index n > 1 is seen in air by a person looking down on the surface. This image, formed by light rays leaving the flat refractive surface, is
a. real and closer to the viewer than the object. b. virtual and closer to the viewer than the object. c. real and farther from the viewer than the object. d. virtual and farther from the viewer than the object. e. virtual and the same distance from the viewer as the object.
A plane wall 15 cm thick has a thermal conductivity given by the relation k = 2.0 + 0.0005 T W/(m K) where T is in degrees Kelvin. If one surface of this wall is maintained at 150 °C and the other at 50 °C, determine the rate of heat transfer per square meter. Sketch the temperature distribution through the wall.
GIVEN
A plane wall
Thickness (L) = 15 cm = 0.15 m
Thermal conductivity (k) = 2.0 + 0.0005 T W/(m K) (with T in Kelvin)
Surface temperatures: Th = 150 °C Tc = 50 °C
FIND
(a) The rate of heat transfer per square meter (q/A)
(b) The temperature distribution through the wall
ASSUMPTIONS
The wall has reached steady state
Conduction occurs in one dimension
SKETCH
The earth's orbit has a mean radius of 1.5 × 108 km. Over a six-month period, the apparent position of a particular star varies by 0.00014° due to parallax
How many kilometers is this star from Earth? A) 1.2 × 1017 km B) 1.2 × 1014 km C) 1.2 × 1020 km D) 1.2 × 1011 km