Which of the following is a Kuiper Belt Object that is quite large and has about the same diameter as Pluto but is 27% more massive?
A) Titan
B) Io
C) Eris
D) Nereid
C
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A common experience is to find that a steady pull is required to keep an object moving, even on a level surface, when friction is present. Analyzing this experience in light of the laws of motion, the accepted conclusion is that
A. the laws of motion do not apply where there is friction. B. the laws of motion only apply when you start pulling or stop. C. the object is really accelerating but it is not apparent. D. your pull is canceled by the third law reaction force. E. a frictional force exactly opposes your pull and the first law applies.
Hot water is used to heat air in a double pipe heat exchanger as shown in the following sketch. If the heat transfer coefficients on the water side and on the air side are 550 W/(m2K) and 55 W/(m2 K), respectively, calculate the overall heat transfer coefficient based on the outer diameter. The heat exchanger pipe is 5 cm, schedule 40 steel (k = 54 W/m K), with water inside.
GIVEN
• A double pipe heat exchanger with water in inner tube and air in the annulus
• Heat transfer coefficients
? Water side ih = 550 W/(m2 K)
? Air side oh = 55 W/(m2 K)
• Inner pipe: 5 cm, schedule 40 steel
• Pipe thermal conductivity (k) = 54 W/(m K)
FIND
• The overall heat transfer coefficient based on the outer diameter (Uo). ASSUMPTIONS
• Uniform heat transfer coefficients
SKETCH
PROPERTIES AND CONSTANTS
for 5 cm, schedule 40 pipe
? Outside diameter (Do) = 2.375 in = 6.033 cm=0.0603 m
? Wall thickness (t) = 0.154 in=0.39 cm=0.0039 m
Refer to the speedometer in Figure 2.3. The speedometer reading 75 mph is
A. 200 meters per second. B. the only speed at which mph and km/h are equal. C. approximately 2 kilometers per minute. D. exactly 1 mile per minute.
Momentum: A proton, which has a mass of 1.67 × 10-27, is moving at 0.80c relative to the laboratory. What does a physicist in that lab measure for its momentum? (c = 3.0 × 108 m/s)
A. 4.0 × 10-19 kg ? m/s B. 4.4 × 10-19 kg ? m/s C. 5.0 × 10-19 kg ? m/s D. 5.8 × 10-19 kg ? m/s E. 6.7 × 10-19 kg ? m/s