Quiz1-Sol-SSII09

# Quiz1-Sol-SSII09 - Physics 2C Summer Session II Quiz#1...

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Physics 2C Summer Session II Quiz #1 Multiple Choice. Choose the answer that best completes the statement or answers the question. 1 . A 1000 m wide dam holds back a lake that is 32 m deep and 20 km long. What force does the water exert on the dam (include atmospheric pressure, P atm = 1 : 013 10 5 Pa )? A) 3 : 25 10 9 N B) 6 : 50 10 10 N C) 5 : 02 10 9 N D) 8 : 26 10 9 N E) 1 : 65 10 11 N . The force on the dam is given by F = R PdA: Since P = P 0 + and dA = Wdz; the total force is F = W Z 32 0 ( P atm + ) dz = 1000 Z 32 0 1 : 013 10 5 + 9 : 8 10 3 z ± dz F = 8 : 26 10 9 N ! D F = h P i A = ² P atm + 2 ³ Wd F = ² 1 : 013 10 5 + 9 : 8 10 3 32 2 ³ 32000 = 8 : 26 10 9 N 2 . A partially full beer bottle with an interior diameter of 36 mm and an exterior diameter of 48 mm is ±oating upright in water. A drinker takes a swallow and replaces the bottle after which it ±oats 21 mm higher than before. How much beer was swallowed? (Assume that the density of beer is identical to that of water.) A) 85 cm 3 B) 21 cm 3 C) 55 cm 3 D) 152 cm 3 E) 38 cm 3 The change in displacement by the beer bottle is V = ± 4 (4 : 8) 2 2 : 1 = 38 cm 3 ! E 3 . Assuming

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## This note was uploaded on 08/11/2009 for the course PHYS PHYS 2C taught by Professor Okamura during the Summer '09 term at UCSD.

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Quiz1-Sol-SSII09 - Physics 2C Summer Session II Quiz#1...

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