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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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.
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 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?
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?