The image formed by a concave mirror when the object distance is greater than the focal length is always
A. at a distance greater than the focal length.
B. real.
C. right side up.
D. virtual.
Answer: B
Physics & Space Science
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The mean free path of a molecule is 
m in an ideal gas at standard temperature and pressure. What is the mean free path when the diameter of the molecule is doubled?
A. 
B. 
C. 
D. 
E. 
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Pluto, discovered in 1930, was "demoted" to "dwarf planet" status in 2006 simply because it is much smaller than the other planets.
a. true b. false
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How much heat is required to raise the temperature of a 225-g lead ball from 15.0°C to 25.0°C? The specific heat of lead is 128 J/kg ? K
A) 725 J B) 576 J C) 145 J D) 217 J E) 288 J
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Earth's oceanic crust ranges in thickness from about
a. 98 to 140 km. b. 5 to 11 km. c. 19 to 98 km. d. 18 to 26 km.
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