A submarine rests on the sea bottom. The normal force exerted upon the sub by the sea-floor is equal to
A) the buoyant force less 1 atmosphere acting on the sub.
B) the weight of the sub plus the weight of the displaced water.
C) the weight of the sub.
D) the weight of the sub less the weight of the displaced water.
E) the weight of the displaced water.
D
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The Crab Nebula is an example of a(n) ________
Fill in the blank(s) with correct word
An iron nail is brought near a magnet. Which of these is not true?
a. The nail has a north pole and a south pole. b. The nail becomes a north pole or a south pole. c. The magnet exerts an attractive force on the nail. d. The nail exerts an attractive force on the magnet. e. The nail is ferromagnetic.
Water at atmospheric pressure is boiling in a pot with a flat copper bottom on an electric range which maintains the surface temperature at 115°C. Calculate the boiling heat transfer coefficient.
GIVEN
? Water at atmospheric pressure boiling in a copper bottom pot
? Surface temperature of the pot bottom (Ts ) = 115°C
FIND
? The boiling heat transfer coefficient (hb)
ASSUMPTIONS
? Temperature of the pan bottom is uniform
? The copper is polished
SKETCH
PROPERTIES AND CONSTANTS
From Appendix 2, Table 13, for saturated water at 1 atm (Tsat = 100°C)
During its early history, matter dominated the Universe
a. True b. False Indicate whether the statement is true or false