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

Physics & Space Science

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A stone is thrown straight up. What is its acceleration on the way down?

What will be an ideal response?

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The sun is km from the Earth. How long does it take for light to travel this distance?

A.
B.
C.
D.
E.

Physics & Space Science

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

Physics & Space Science

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

Physics & Space Science