A square bronze fin, 30 cm wide. 1 cm thick, and 5 cm long is surrounded by air at 27ºC having a convective heat transfer coefficient of 300 W/m^2 ?K. Determine the fin tip temperature, the fin heat transfer, and the fin efficiency.
What will be an ideal response?
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Of the normal elements around us, the Big Bang produced:
A) none, only energy. B) only hydrogen. C) hydrogen and helium. D) all elements up to iron. E) all elements in much their present proportions.
A proton starting from rest travels through a potential of 1.0 kV and then moves into a uniform 0.040-T magnetic field. What is the radius of the proton's resulting orbit? (mproton = 1.67 × 10-27 kg, e = 1.60 × 10-19 C)
A) 0.080 m B) 0.11 m C) 0.14 m D) 0.17 m E) 0.19 m
A long, straight wire (radius = 2.0 mm) carries a current of 2.0 A distributed uniformly over a cross section perpendicular to the axis of the wire. What is the magnitude of the magnetic field at a distance of 1.0 mm from the axis of the wire?
a. 0.40 mT b. 0.80 mT c. 0.10 mT d. 0.20 mT e. 0.75 mT
The magnitude of the magnetic field that a long and extremely thin current-carrying wire produces at a distance of 3.0 µm from the center of the wire is 2.0 × 10-3 T. How much current is flowing through the wire? (?0 = 4? × 10-7 T ? m/A)
A) 380 mA B) 190 mA C) 30 mA D) 19 mA