Due to the galaxy density and collisions, ________ are rare in the centers of clusters
A) irregulars
B) quasars
C) spirals
D) black holes
E) blazars
C
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The radius of a typical nucleus is about 5 × 10-15 m
Assuming this to be the uncertainty in the position of a proton in the nucleus, estimate the uncertainty in the proton's energy, in MeV. (mproton = 1.67 × 10-27 kg, h = 6.626 × 10-34 J ? s, 1 eV = 1.6 × 10-19 J) A) 0.8 MeV B) 1.0 MeV C) 0.6 MeV D) 0.4 MeV
When a star collapses to become a black hole, its mass
A) increases. B) decreases. C) remains unchanged.
Which of the following contributed to the gradual evolution of life via natural selection?
A) Organisms tend to produce more offspring than the local environment can support. B) Individuals in a population vary in many heritable traits. C) Individuals with traits that help them survive and reproduce are more likely to pass those traits on to succeeding generations. D) All of the above are correct.
It is more difficult to measure the coefficient of volume expansion of a liquid than that of a solid because:
A. no relation exists between linear and volume expansion coefficients B. a liquid tends to evaporate C. a liquid expands too much when heated D. a liquid expands too little when heated E. the containing vessel also expands