Two +6.0-µC charges are placed at two of the vertices of an equilateral triangle having sides 2.0 m long. What is the electric potential at the third vertex, relative to infinity, due to these charges? (k = 1/4??0 = 9.0 × 109 N ? m2/C2 )
A) 108 V B) 54 kV C) 90 kV D) 0 V E) 27 kV
B
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A solar collector is at 25ºC and is facing the night sky at -50ºC. If the collector emissivity is 0.9 and its absorptivity is 0.85, determine the net radiation of the solar collector.
What will be an ideal response?
The equation has been proposed by Hausen for the transition range (2300 < Re < 8000) as well as for higher Reynolds numbers. Compare the values of Nu predicated by Hausen’s equation for Re = 3000 and Re = 20,000 at D/L = 0.1 and 0.01 with those obtained from Gnielinski correlation. Assume the fluid is water at 15°C flowing through a pipe at 100°C.
GIVEN
• Water flowing through a pipe
• The Hausen correlation given above
• Water temperature = 15°C
• Pipe temperature = 100°C
FIND
• The Nusselt number using the Hausen correlation and appropriate equations and charts in the text for Re = 3000 and 20,000 and D/L = 0.1 and 0.01
ASSUMPTIONS
• Steady state
• Constant and uniform pipe temperature
SKETCH
PROPERTIES AND CONSTANTS
for water at 15°C
Absolute viscosity (?b) = 1136 × 10–6 (Ns)/m2
Prandtl number (Pr) = 8.1 At 100°C ?s = 277.5 × 10–6 (Ns)/m2
Prs= 1.75
A person of initial mass 70. kg climbs a stairway, rising 6.0 m in elevation. By how much does his mass increase by virtue of his increased potential energy?
What will be an ideal response?
Which of these statements is true?
a. The value of g is 1. b. The value of g is exactly constant at any given distance from Earth's center. c. Even at a given distance from Earth's surface, the value of g can vary slightly. d. The value of g changes a great deal from place to place at a given elevation on Earth's surface. e. The value of g is exactly constant all over Earth's surface.