Water with a density of 1,000 
flows through a 2.00 cm diameter pipe with a velocity of 2.40 m/s. What is the volume flow rate?
A. 
B. 
C. 
D. 
E. 
C.
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As shown below, a garden room has three walls, a floor, and a roof, but is open to the garden on one side. The wall widths are L and w. The roof height is h. When traveling sound waves enter the room, standing sound waves can be present in the room if the wavelength of the standing waves is
?
?
A.
, where n is a positive integer.B.
, where n is an odd integer.C.
, where n is an even integer.D.
E.
If Q = 400 ?C and the potential difference VA ? VB = ?10 V in the circuit segment shown below, what is the current in the resistor?
a.
1.0 mA right to left
b.
1.0 mA left to right
c.
3.5 mA right to left
d.
3.5 mA left to right
e.
None of the above
The orbits of most asteroids
A) lie beyond Neptune. B) lie entirely beyond the orbit of Mars. C) cross the orbit of Mars. D) cross the orbit of Earth. E) cross the orbits of all four terrestrial planets.
A plane wall of thickness 2L has internal heat sources whose strength varies according to 0q is the heat generated per unit volume at the center of the wall (x = 0) and a is a constant. If both sides of the wall are maintained at a constant temperature of Tw, derive an expression for the total heat loss from the wall per unit surface area.
GIVEN
A plane wall with internal heat sources Heat source strength: q
Gcos (ax) Wall surface temperatures = Tw Wall thickness = 2L
FIND
An expression for the total heat loss per unit area (q/A)
ASSUMPTIONS
Steady state conditions prevail
The thermal conductivity of the wall (k) is constant
One dimensional conduction within the wall
SKETCH
