For the ground state of the hydrogen atom, which of the following represents the correct value of the orbital angular momentum quantum number?
A) -1
B) 1
C) 0
D) 2
E) -2
C
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A furnace wall is to be constructed of brick having standard dimensions 22.5 cm* 11 cm * 7.5 cm. Two kinds of material are available. One has a maximum usable temperature of 1040°C and a thermal conductivity of 1.7 W/(m K), and the other has a maximum temperature limit of 8700C and a thermal conductivity of 0.85 W/(m K). The bricks have the same cost and are laid in any manner, but we wish to design the most economical wall for a furnace with a temperature of 10400C the hot side and 2000C on the cold side. If the maximum amount of heat transfer permissible is 950 W/m2 , determine the most economical arrangement using the available bricks.
GIVEN
Furnace wall made of 22.5 ? 11 ? 7.5 cm bricks of two types
Type 1 bricks Maximum useful temperature (T1,max) = 1040°C=1313 K
Thermal conductivity (k1) = 1.7 W/(m K)
Type 2 bricks Maximum useful temperature (T2,max) = 870°C= 1143 K
Thermal conductivity (k2) = 0.85 W/(m K)
Bricks cost the same
Wall hot side (Thot) = 1040°C=1313 K and cold side (Tcold) = 200°C=473 K
Maximum heat transfer permissible (qmax/A) = 950 W/m2
FIND
The most economical arrangement for the bricks
ASSUMPTIONS
One dimensional, steady state heat transfer conditions
Constant thermal conductivities
The contact resistance between the bricks is negligible
SKETCH
A point charge Q is placed on the x axis at x = ?2.0 m. A second point charge, ?Q, is placed at x = 1.0 m. If Q = 60 ?C, what is the magnitude of the electrostatic force on a 40-?C charge placed at the origin?
A. 16 N B. 27 N C. 32 N D. 11 N E. 3.0 N
You can hear sound through an open window from sources that are not in your line of sight because of
a. interference b. diffraction c. the sound level d. the Doppler effect e. none of the above
Discuss the source of energy for a star like the Sun when it is on the Main Sequence. Include the role of nuclear, electrical, and gravitational forces, temperature, and chemical composition
How long can this star burn its fuel and what marks the end of this stage of its life?