The simply supported beam ABC shown below is acted upon by applied axial force P at B; by linearly varying distributed load q on BC; and by applied moments MA and MC. Reaction forces are given in the figure in terms of load variable P. The axial force (N), shear (V), and bending moment (M) at mid-span are (in terms of variables L and P):
(A) 0, 0.22P, 0.63PL
(B) P, 0.29P, 0.33PL
(C) 0, 1.36P, 0.33PL
(D) 0, 0.29P, 0.33PL
(D) 0, 0.29P, 0.33PL
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The sidereal period of the Moon is
a. about 27.32 days long. b. the period of time for the Moon to orbit Earth once with respect to the stars. c. the period of time between successive eclipses at a given location on Earth. d. the period of time from when the Moon rises until the Moon rises again the next night. e. about 27.32 days long and the period of time for the Moon to orbit Earth once with respect to the stars.
The energy a white dwarf emits into space is
a. replaced by fusion of hydrogen atoms into helium. b. replaced by fusion of helium atoms into carbon. c. not replaced.
If the magnitude difference between one star and another is 1, the stars differ in brightness by a factor of
a. 10. b. 100. c. 2.51. d. 4.
A object is 12 cm in front of a concave spherical mirror, and the image is 3.0 cm in front of the mirror. What is the focal length of the mirror?
A) 15 cm B) 4.0 cm C) 0.25 cm D) 2.4 cm E) 1.3 cm