Which of the following best characterizes electrical insulators?
a. charges on the surface don't move
b. high tensile strength
c. electric charges move freely
d. good heat conductors
a
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_____ says that energy must flow from hot regions to cooler regions either by conduction, convection, or radiation
A) The law of energy transport B) The law of conservation of energy C) The theory of energy equilibrium D) The theory of special relativity
A thin film of soapy water, n = 1.37, is held vertical. Light of wavelength 600 nm is reflected from the film and horizontal dark lines appear. What is the thinnest soap film for which a bright band will occur?
A. 150 nm B. 109 nm C. 90.0 nm D. 438 nm E. 219 nm
Applications to Astronomy: It can be shown that the approximate age of the universe is 1/H, where H is the Hubble constant. Taking H = 20 
, estimate the age of the universe, in years. (1 ly = 9.46 × 1015 m)
A. 15 thousand years B. 15 million years C. 15 billion years D. 50 billion years
Based on current evidence and models, visible, luminous matter (such as the stars within galaxies) amounts to approximately what percentage of the total mass and energy of the universe?
A) less than 1 percent B) 10 percent C) 25 percent D) 50 percent