The point P lies along the perpendicular bisector of the line connecting two long straight wires S and T perpendicular to the page. A set of directions A through H is shown next to the diagram. When the two equal currents in the wires are directed up out of the page, the direction of the magnetic field at P is closest to the direction of
a.
E.
b.
F.
c.
G.
d.
H.
e.
A.
a
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The Doppler effect is observed when the source and the observer are at rest with respect to each other
Indicate whether the statement is true or false
A(n) ______________ transfers heat from a low-temperature reservoir to a high-temperature reservoir
Fill in the blank(s) with correct word
Conversion of Units: Your car gets 34.7 mi/gal on a vacation trip in the U.S. If you were figuring your mileage in Europe, how many km/L did it get? (3.79 L = 1.00 gal; 1.00 mi = 1.61 km)
A. 14.7 km/L B. 9.16 km/L C. 55.9 km/L D. 32.4 km/L
A section of a composite wall with the dimensions shown below has uniform temperatures of 200°C and 50°C over the left and right surfaces, respectively. If the thermal conductivities of the wall materials are: kA = 70 W/(m K), kB = 60 W/(m K), kc = 40 W/(m K) and kD = 20 W/(m K), determine the rate of heat transfer through this section of the wall and the temperatures at the interfaces.
GIVEN
• A section of a composite wall
• Thermal conductivities
? kA = 70 W/(m K)
? kB = 60 W/(m K)
? kC = 40 W/(m K)
? kD = 20 W/(m K)
• Surface temperatures
? Left side (TAs) = 200°C
? Right side (TDs) = 50°C
FIND
(a) Rate of heat transfer through the wall (q) (b) Temperature at the interfaces
ASSUMPTIONS
• One dimensional conduction
• The system is in steady state
• The contact resistances between the materials is negligible
SKETCH
