Determine the heat transfer and fin efficiency for a copper fin shown in Figure 2-72. The fin can be assumed to be very long and its base temperature taken as 200ºF.
Physics & Space Science
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A positive ion has a deficiency of
A) electrons. B) neutrons. C) negative ions.
Physics & Space Science
The maximum value of the electric field in an electromagnetic wave is 2.0 V/m. What is the maximum value of the magnetic field in that wave? (c = 3.0 × 108 m/s)
A) 6.7 pT B) 6.7 mT C) 6.7 nT D) 6.7 ?T E) 6.7 T
Physics & Space Science
The thermal efficiency of a heat engine is given by
A.
.B.
.C.
.D.
all of the formulas above.
E.
only (a) or (b) above.
Physics & Space Science
Two traveling waves have the forms z1 = A sin(kx - ?t), z2 = A sin(kx + ?t ) Express their superposition in the form of a standing wave
A) 2A cos(kx) cos( ?t ) B) 2A sin(kx) cos( ?t ) C) 2A sin(kx) sin( ?t ) D) A sin[(kx )2 - (?t )2] E) 2A cos(kx) sin( ?t )
Physics & Space Science