When weight is applied to the top of a stone arch, the stone blocks in the arch undergo
A) tension.
B) compression.
C) expansion.
D) none of the above
Answer: B
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Which of the following best explains the hypothesized phenomenon of black hole evaporation?
A) Particles (or anti-particles) are occasionally ejected from within the event horizon, causing the black hole to lose mass. B) Virtual particles created near the black hole are constantly annihilating each other, causing a very high temperature even if the black hole has no accretion disk. This high temperature provides escape velocity for the virtual particles, causing the entire "cloud" of virtual particles to expand away into space. C) Particles (or anti-particles) are created by a quantum mechanical effect near, but outside, the event horizon of the black hole. The law of conservation of energy maintains that the black hole must lose energy to "pay" for the creation of this mass. D) Black hole evaporation is a virtual process, meaning that it has been theorized by astrophysicists, but doesn't really occur.
The wavelengths associated with thermal radiation at everyday temperatures are in the ________ spectral region.
A. infrared B. ultraviolet C. shorter visual D. longer visual E. x-ray
Two cylinders, one made of lead (density 11340 
and one of copper (density 8940
have the same radius and height. When thrown into a pool of water (density 1000
as the two are sinking to the bottom, describe the buoyant forces on the cylinders.
A. The buoyant force on the lead cylinder is greater than that on the copper. B. There is no buoyant force on either, as they are sinking. C. The buoyant force on the copper cylinder is greater than that on the lead. D. The buoyant force is the same on each cylinder.
The temperature of a 100 m diameter cooling pond is 7°C on a winter day. If the air temperature suddenly drops to –7°C, calculate the thickness of ice formed after three hours.
GIVEN
? A round cooling pond on a winter day
? Initial temperature (Tl) = 7°C
? Air temperature (T?) drops to –7°C
? Pond diameter (D) = 100 m
FIND
? The thickness of ice (?) formed after 3 hours
ASSUMPTIONS
? The thermal capacitance of the ice layer is negligible
? Radiative heat transfer is negligible
? Bulk water temperature remains constant at 7°C
? Air temperature is constant at –7°C
? The air and water are still
SKETCH
PROPERTIES AND CONSTANTS
The ice property values given in the problem statement of Problem 9.37 is
Extrapolating from Appendix 2, Table 28, for dry air at the estimated film temperature of –3.5°C
From Appendix 2, Table 13, for water at the estimated film temperature of 3.5°C
