What is the basic definition of a black hole?
A) any compact mass that emits no light
B) a dead star that has faded from view
C) any object from which the escape velocity exceeds the speed of light
D) any object made from dark matter
E) a dead galactic nucleus that can only be viewed in infrared
C
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________ galaxies may contain a few million to few trillion solar masses.
A. Spiral B. Independent of their type C. Irregular D. Elliptical
Two identical objects in outer space, one moving at 2 m/s, the other at 1 m/s, have a head-on collision and stick together. Their combined speed after the collision is
A) 0.5 m/s. B) 0.33 m/s. C) 0.67 m/s. D) 1.0 m/s. E) none of the above
A brass rod, 4.0 m long and with a cross sectional area of 9.2 × 10-6 m2 is subjected to a tension of 6.0 × 103 N/m2. The Young's modulus for brass is 9.0 × 1010 N/m2, and the Poisson ratio is 0.48. By how much does the volume of the rod change?
A) 6.3 × 10-7 m3 B) 0.029 m3 C) 2.7 × 10-7 m3 D) 4.0 × 10-7 m3 E) 5.2 × 10-7 m3
What minimum thickness of oil (n = 1.50) on the surface of water (n = 1.33) would give constructive interference for 550 nm light with normal incidence?
A. 78.0 nm B. 80.0 nm C. 92.0 nm D. 183 nm E. 275 nm