The magnitude of the magnetic field 8.0 cm from a straight wire carrying a current of 6.0 A is
A)
1.5 × 10-3 T.
B)
1.5 × 10-5 T.
C)
3.0 × 10-3 T.
D)
3.0 ? × 10-4 T.
E)
3.0 × 10-5 T.
B
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A long 0.6-m-OD 347 stainless steel (k = 14 W/(m K)) cylindrical billet at 16°C room temperature is placed in an oven where the temperature is 260°C. If the average heat transfer coefficient is 170 W/(m2 K), (a) estimate the time required for the center temperature to increase to 232°C by using the appropriate chart and (b) determine the instantaneous surface heat flux when the center temperature is 232°C.
GIVEN
• A long cylindrical billet placed in an oven
• Billet outside diameter = 0.6 m
• Thermal conductivity (k) = 14 W/(m K)
• Initial temperature (Ti) = 16°C
• Oven temperature (T?) = 260°C
• The average heat transfer coefficient h c= 170 W/(m2 K)
• Center temperature increases to 232°C
FIND
(a) The time required using the appropriate chart (b) The instantaneous surface heat fluxes when the center temperature is 232°C
ASSUMPTIONS
• Radial conduction only in billet
• Uniform and constant properties
SKETCH
Resistors in Combination: Each of the resistors shown in the figure has a resistance of 180.0 ?. What is the equivalent resistance between points a and b of this combination?
A. 450.0 ? B. 720.0 ? C. 540.0 ? D. 180.0 ?
Which of the following elements in your body is formed in stars?
A. calcium B. carbon C. oxygen D. iron E. All of these choices are correct.
The kinetic energy of a planet is maximum when it is
A) closest to the Sun. B) farthest from the Sun. C) least accelerating. D) none of the above