Applications to Astronomy: Stars A and B are both black holes but have different masses. If the mass of star A is twice as much as the mass of star B, the average density of star A, compared to the average density of star B will be
A. the same.
B. twice as much.
C. half as much.
D. four times as much.
E. one-fourth as much.
Answer: E
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The first evidence confirming the crystal structure of matter was
A) the citing of experiments by Nobel Prize-winning scientists. B) testimonials by crystal-loving investigators. C) X-ray diffraction patterns.
What energy must be added or given off in a reaction where a helium atom is separated into two hydrogen atoms and two neutrons? (Atomic masses for each: hydrogen, 1.007825 u; neutron, 1.008665 u; helium, 4.002602 u; also, 1 u = 931.5 MeV/c2.)
a. 28.3 MeV given off b. 20.7 MeV added c. 20.7 MeV given off d. 28.3 MeV added
You shout at a cliff, and hear your echo in 2 seconds. If the speed of sound in the air is 340 m/s, the distance of the cliff from you is
a. 85 m. b. 170 m. c. 340 m. d. 680 m. e. none of the above.
A proton is located at the point (x = 1.0 nm, y = 0.0 nm) and an electron is located at the point Find the magnitude of the electrostatic force that each one exerts on the other. (k = 1/4??0 = 9.0 × 109 N ? m2/C2, e = 1.6 × 10-19 C)
A) 1.4 × 10-11 N B) 5.3 × 10-18 N C) 5.3 × 108 N D) 5.9 × 10-15 N