What is the number of photons per second given off by a light bulb with a power of 100 Watts operating at an efficiency of 4.80%? Assume the wavelength of light to be 600 nm
A)
6.34 × 1018 photons/s
B)
5.42 × 1018 photons/s
C)
3.11 × 1018 photons/s
D)
25.3 × 1018 photons/s
E)
14.5 × 1018 photons/s
E
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On bracket ABCDEF, each y-direction force acts at the center of the bar segment to which it is applied (see figure). All turns of ABCDEF are 90o angles. The resultant moment at B (MB) for this parallel force system is (in N?m)
(A) 395j 1 1080k
(B) 415i 1 875k
(C) 485i 2 913k
(D) 2485i 1 913k
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