The idea that we live in a universe (literally, "one story"), in which the same law of gravity applies both on Earth and in space, was established through the work of
A) Newton.
B) Copernicus.
C) Kepler.
D) Galileo.
A) Newton.
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A concrete wall is 15.0 cm thick and has an area of 10.0 m2. A layer of wood that is 2.50 cm thick is placed over the wall to reduce the loss of heat by thermal conduction. The coefficient thermal conductivity of concrete is 1.70 W/m 
and the coefficient of thermal conductivity of wood is 0.0400 W/m 
What is the effective coefficient of thermal conductivity of the wood on concrete system?
A. 0.245 W/m 
B. 1.22 W/m
C. 1.65 W/m
D. 2.02 W/m
E. 2.34 W/m
A candle emits what kind of spectrum?
A. blueshifted B. emission-line C. absorption-line D. continuous E. redshifted
Which moon is rich in organic molecules but too cold to support chemical evolution?
a. Europa b. Titan c. Enceladus d. Io e. Ganymede
Dispersion occurs when:
a. some materials bend light more than other materials. b. a material slows down some wavelengths more than others. c. a material changes some frequencies more than others. d. light has different speeds in different materials.