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Quiz6A - Physics 2 C Spring 2009 Quiz6A Nam e 5 3 3...

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Unformatted text preview: Physics 2 C Spring 2009 Quiz6A Nam e___________________________________ 5 3 3 Constants 1 Atm osphere = 1.0 x10 Pa, density of water = 1000 kg/m , density of air = 1.3 kg/m MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) A hot air balloon plus its ca rgo has a m ass of 400 kg, and it holds 700 m 3 of hot air. It is floating at 3 a constant height in air with a density of 1.29 kg/ m . What is the density of the hot air in the 1) balloon? A) 0.72 kg/m 3 B) 0.57 kg/m 3 C) 1 .39 kg/m 3 D) 0.86 kg/m 3 E) 0.43 kg/m 3 2) A 15 000­N car on a hydraulic lift rests on a cylinder with a piston of radius 0.20 m . If a 2) connecting cylinder with a piston of 0.040­m radius is driven by compressed air, what force must be applied to this smaller piston in order to lift the car? A) 3000 N B) 500 N C) 600 N D) 1200 N E) 300 N 3) If one blows carefully across the to p of a straw sticking up 0.100 m from the liquid in a soft 3) drink can, it is possible to make the soft drink rise half way up the straw and stay there. How fast must the air be blown across the top of the straw? A) 76 m /s B) 35 m /s C) 19 m /s D) 27 m /s E) 12 m /s 4) The pressu re inside a com m ercial airliner is m aintained at 1.00 atm . What is the net outward 4) force exerted on a 1.0 m x 2.0 m cabin door if the outside pressure is 0.30 atm ? 4 A) 1.4x10 N 5 B) 7.0x10 N 5 C) 1.4x10 N 4 D) 6.0x10 N E) 2.8x10 5 N 5) You are planning to dig a well and pum p the water out with a pum p placed at the surface. What is the m axim um depth that the well ca n have? A) any depth B) 54 m C) 76 m D) 23 m E) 10 m 5) 6) Water flowing sm oothly out of a faucet with a diam eter of 2.00 cm at a volum e flow ra te of 100 cm 3 n a stream that decreases in diam eter with distance as it falls. How far m ust it fall so that /s i 6) the diam eter of the stream is equal to 1/2 of its initial diam eter? A) 5.4 cm B) 3.5 cm C) 7.7 cm cm D) 2.9 cm 1 E) 4.5 cm Answer Key Testname: QUIZ 6 1) A 2) C 3) D 4) C 5) E 6) C 2 ...
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