Which one of the diagrams below is not a possible electric field configuration for a region of space which does not contain any charges?
a.
b.
c.
d
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Determine the steady-state temperatures of two radiation shields placed in the evacuated space between two infinite planes at temperatures of 555 K and 278 K. The emissivity of all surfaces is 0.8.
GIVEN
? Two radiant shields placed in the evacuated space between two infinite planes
? Temperature of the planes
? T1 = 555 K
? T4 = 278 K
? Emissivity of all surface (?) = 0.8
FIND
? The steady state temperatures of the shields (T2, T3)
ASSUMPTIONS
? All surfaces are gray and diffuse
SKETCH
A drive shaft running at 2500 rpm has outer diameter of 60 mm and inner diameter of 40 mm. The allowable shear stress in the shaft is 35 MPa. The maximum power that can be transmitted is approximately:
(A) 220 kW
(B) 240 kW
(C) 288 kW
(D) 312 kW
A toy is 14 cm in front of a convex spherical mirror. If the image of the toy is 5.8 cm behind the mirror, what is the focal length of the mirror?
A) -4.1 cm B) +20 cm C) -9.9 cm D) -20 cm E) +9.9 cm
A 24-kW electric furnace is connected to a 240-V line. What is the resistance of the furnace?
A) 1000 ? B) 10 ? C) 2.4 ? D) 0.42 ? E) 100 ?