Interactions among galaxies also are thought to influence a galaxy's type in at least some cases. Which of the following does not support the idea that interactions can shape galaxies?
A) the fact that more distant galaxies have larger redshifts
B) computer modeling of collisions between galaxies
C) the fact that galaxies with distorted appearances are more common at great distances than nearby
D) the presence of features such as "tails" extending out of galaxies, bridges between galaxies, and rings of stars around galaxies
A) the fact that more distant galaxies have larger redshifts
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Which one of the following is not true of neutrinos?
a. They have no charge. b. They have no spin. c. One type of neutrino may change into another type of neutrino. d. They are leptons. e. They do not take part in strong nuclear interactions.
Steel blocks A and B, which have equal masses, are at TA = 300 °C and TB = 400 °C. Block C, with mC = 2mA, is at TC = 350 °C. Blocks A and B are placed in contact, isolated, and allowed to come into equilibrium. Then they are placed in contact with block C. At that instant,
a. TA = TB < TC. b. TA = TB = TC. c. TA = TB > TC. d. TA + TB = TC. e. TA - TB = TC.
Vision Problems: A farsighted boy has a near point at 2.3 m and requires contact lenses to correct his vision to the normal near point. What is the correct choice of lens power for the contact lenses?
A. -0.28 diopters B. +0.28 diopters C. -3.6 diopters D. +3.6 diopters E. +1.8 diopters