The force in member FE of the plane truss below is approximately:
(A) 21.5 kN
(B) 22.2 kN
(C) 3.9 kN
(D) 4.7 kN
(C) 3.9 kN
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Based on a comparison of the radio, infrared, and visible-light images, we can conclude that gas clouds containing molecules
A) absorb roughly equal amounts of infrared starlight and visible starlight B) absorb substantial amounts of visible starlight but no infrared starlight C) absorb infrared starlight less effectively than they absorb visible starlight
All RR Lyrae stars are about 5 times the Sun's luminosity
Indicate whether the statement is true or false
Estimate the observed wavelength for the 656 nm line in the spectrum of a star which is 100 million light-years from us
A) 653 nm B) 659 nm C) 661 nm D) 677 nm E) 692 nm
As you crawl toward the edge of a large freely-rotating horizontal turntable in a carnival funhouse, the angular momentum of you and the turntable
A) decreases. B) increases. C) remains the same, but the revolutions per minute decrease. D) decreases in direct proportion to your decrease in revolutions per minute. E) none of these