Household circuits are wired in ________
a. series
b. parallel
c. both series and parallel
d. neither series nor parallel
b
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A cylindrical tank is assembled by welding steel sections in a helical pattern with angle ? 5 50°. Tank diameter is 1.6 m, thickness is 20 mm, and internal pressure is 2.75 MPa. Modulus E 5 210 GPa and Poisson’s ratio ? 5 0.28. The circumferential strain in the wall of the tank is approximately:
(A) 1.9 3 1024
(B) 3.2 3 1024
(C) 3.9 3 1024
(D) 4.5 3 1024
The critical temperature to initiate the proton-proton cycle in the cores of stars is
A) 3,000 K. B) 5,800 K. C) 2,300,000 K. D) 10 million K. E) 100 million K.
Analyze the NASA sunspot image shown. Based on that image, what is (or was) the best year to go travel to high latitudes to see the Northern Lights?
a. 2001
b. 2009
c. 2012
d. 2014
Calculate the reaction energy (Q value) for the reaction 7Li + 1H ? 4He + 4He, given the following masses:
7Li: 7.016005 u 1H: 1.007825 u 4He: 4.002603 u (1 u = 931.5 MeV/c2) A) 15.37 MeV B) 17.35 MeV C) 17.53 MeV D) 13.57 MeV E) 13.35 MeV