Determine the shape factors between the three surfaces A1, A2, and A3 indicated in the figure.
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Which of the following is evidence for supermassive black holes in active galaxies?
A) the discovery of powerful jets coming from a compact core B) rapid changes in the luminosity of the galaxy nucleus C) quasars emit approximately equal power at all wavelengths from infrared to gamma rays D) very high speed orbital motions around galactic nuclei E) all of the above
As a system loses its ability to do useful work
A) energy increases. B) entropy decreases. C) energy decreases. D) entropy increases. E) entropy remains constant.
A monochromatic beam of light of wavelength 600 nm is incident normally on a diffraction grating with a slit spacing of 1.70 × 10-4 cm. What is the angle for the first order maximum?
A) 10.5° B) 12.1° C) 16.4° D) 18.2° E) 20.7°
At an instant when a particle of mass 80 g has a velocity of 25 m/s in the positive y direction, a 75-g particle has a velocity of 20 m/s in the positive x direction. What is the speed of the center of mass of this two-particle system at this instant?
a. 16 m/s b. 45 m/s c. 23 m/s d. 20 m/s e. 36 m/s