An interval of one Celsius degree is equivalent to an interval of:
a. one Fahrenheit degree.
b. one kelvin.
c. 5/9 Fahrenheit degree.
d. 5/9 kelvin.
b
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Water at 180°C enters a bare, 15-m-long, 2.5-cm wrought iron pipe at 3 m/s. If air at 10°C flows perpendicular to the pipe at 12 m/s, determine the outlet temperature of the water. (Note that the temperature difference between the air and the water varies along the pipe.)
GIVEN
• Wrought-iron pipe with water flow inside and perpendicular air flow outside
• Water entrance temperature (TW,in) = 180°C
• Water velocity (VW) = 3 m/s
• Pipe length (L) = 15 m
• Pipe diameter (D) = 2.5 cm = 0.025 m
• Air temperature (Ta) = 10°C
• Air velocity (Va) = 12 m/s FIND
• Outlet temperature of the water (TW,out) ASSUMPTIONS
• Steady state
• Air flow approaching pipe is negligible
• Thermal resistance of the pipe is negligible
• The pipe thickness can be neglected
SKETCH
A car travels on a road that, if viewed from the side, has a semicircular dip. When at the bottom of the dip, the occupants of the car feel as though they weigh twice their normal weight. What is the radius of the semicircle if the speed of the car is 27 m/s?
A. 37 m B. 132 m C. 149 m D. 74 m
Fluorescent bulbs have recently become much more efficient due to the introduction of
A) high-emission phosphor coatings on the inside of the bulb. B) new types of gases, that glow brighter, within the tube. C) lower density--i.e., lower pressure--gases within the tube. D) electronically controlled high-frequency ballasts. E) longer bulbs.
Atmospheric pressure is 1.00 × 10^5 N/m2, and the density of air is 1.29 kg/m3 . If the density of air is constant as you get higher and higher, calculate the height of the atmosphere needed to produce this pressure
a. 1 260 m b. 77 000 m c. 7 900 m d. 10 300 m