The reason that most extrasolar planets discovered by the Doppler technique are found close to their parent stars is
A) the closer to a star, the hotter and therefore brighter the planet is.
B) more of the starlight is blocked by the planet when it transits the star.
C) planets that are close to a star are heated up and therefore larger.
D) they transit more frequently, and have thus been more likely to be detected in the short time we have been searching for them.
E) the wavelength shift of the star's spectrum is larger.
E
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A prismatic bar (diameter d0 5 18 mm) is loaded by force P1. A stepped bar (diameters d1 5 20 mm and d2 5 25 mm with radius of fillets R 5 2 mm) is loaded by force P2. The allowable axial stress in the material is 75 MPa. The ratio P1/P2 of the maximum permissible loads that can be applied to the bars, considering stress concentration effects in the stepped bar, is:
(A) 0.9
(B) 1.2
(C) 1.4
(D) 2.1
A positively charged particle has a velocity in the negative z direction at point P. The magnetic force on the particle at this point is in the negative y direction. Which one of the following statements about the magnetic field at point P can be determined from this data?
A. Bx is positive. B. Bz is positive. C. By is negative. D. By is positive. E. Bx is negative.
Which of these is NOT typical of the Galaxy's spiral arms?
A) open clusters B) Population II giants like orange Arcturus C) emission nebulae like M42 D) hot, young blue Population I stars E) O and B stars
Scientists have made great strides towards unifying the fundamental forces of nature. At the time of the publishing of the text, the most unified of theories shows that the total number of forces to be fundamental in physics is
3 1 2 4 5