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Physics 2C Final Exam
Name___________________________________
MULTIPLE CHOICE.
Choose the one alternative that best completes the statement or answers the question.
1) A sealed tank containing
water (density 1g/cubiccm)
to a height of 11m also contains air
above the water at a pressure of 3atm (1atm = 100,000Pa). Water flows out at the bottom
through a small hole. What's the speed of the water flowing out?
A) 20m/s
B) 40m/s
C) 35m/s
D) 25m/s
E) 30m/s
1)
2) A 621.0g iron meteor impacts the earth at a speed of 1922.0 m/s. If its energy was entirely
converted to heat of the meteorite, what will the resultant temperature rise be? (The specific
heat for iron is 447 J/kg
œe
C.)
A) 4000
e
C
B) 16,300
e
C
C) 2,430,000
e
C
D) 6.30
e
C
2)
3) An advertisement for a certain small car claims that it can float in water (density 1g/cubiccm).
The car's mass is 900kg and its interior volume is 3.0 cubic meters. Water gradually leaks in
and displaces the air in the car. What fraction of the interior volume is filled with water when
the car doesn't float anymore?
A) 50%
B) 70%
C) 90%
D) 30%
E) 10%
3)
4) An ice cube is floating in a glass of water. Will the water level rise, fall, or remain the same
when the ice cube melts?
A) stay the same
B) rise
C) fall
4)
5) How long will it take a 500W microwave oven to vaporize completely a 100g block of ice that is
initially at zero degree Celsius? (Lf = 334 kJ/kg; cw = 4.184 kJ/(kg*K), Lv = 2257 kJ/kg)
A) 1 hour
B) 10 hours
C) 10 min
D) 1 min
5)
6) We are comparing a monoatomic with a diatomic gas at a temperature slightly higher than
what's needed to excite rotational degrees of freedom in the gas. Which of the following
statements is most accurate?
A) Both gases have the same average internal energy per molecule.
B) The average internal energy per molecule for the diatomic gas is smaller than that for the
monoatomic gas.
C) The average internal energy per molecule for the diatomic gas is a factor 7/5 larger than
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 Spring '05
 wurthmeir
 Physics, Thermodynamics

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