A pair of 1-ohm resistors connected in series is 2 ohms, and when connected in parallel is
A) 1/2 ohm.
B) 1 ohm.
C) also 2 ohms.
D) none of the above
Answer: A
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Graphical Addition: Consider two vectors 
and 
shown in the figure. The difference 
- 
is best illustrated by
A. choice (a) B. choice (b) C. choice (c) D. choice (d)
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
Which of the following thought of the idea that the intensity of a matter wave represents the probability that an interaction will occur?
A) Born B) Schroedinger C) Planck D) de Broglie E) Einstein
Magnetic Field of a Current Loop: A current-carrying loop of wire lies flat on a horizontal tabletop. When viewed from above, the current moves around the loop in a counterclockwise sense. For points on the tabletop outside the loop, the magnetic field lines caused by this current
A. circle the loop in a clockwise direction. B. circle the loop in a counterclockwise direction. C. point straight up. D. point straight down.