Compared to the primary voltage, the secondary voltage can be
A) higher.
B) lower.
C) the same.
D) any of the above
E) none of the above
Answer: D
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A stone is thrown straight up. What is its acceleration on the way down?
What will be an ideal response?
The sun is km from the Earth. How long does it take for light to travel this distance?
A.
B.
C.
D.
E.
If the outer air temperature in Problem 1.11 is –2°C, calculate the convection heat transfer coefficient between the outer surface of the window and the air assuming radiation is negligible.
GIVEN
• Window: 1 m by 3 m
• Thickness (L) = 7 mm = 0.007 m
• Surface temperatures
? Inner (Ti) = 20°C
? outer (To) = 17°C
• The rate of heat loss = 1040 W (from the solution to Problem 1.11)
• The outside air temperature = –2°C
FIND
• The convective heat transfer coefficient at the outer surface of the window ( h c)
ASSUMPTIONS
• The system is in steady state and radiative loss through the window is negligible
SKETCH
For the multiplication of 6.3 m divided by 2.8 m, the result should be reported with how many significant figures?
a. Two b. One c. Three d. Four e. Seven