What fuel do stars on the main sequence burn?
A. helium
B. carbon
C. hydrogen
D. uranium
E. iron
Answer: C
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Shield volcanoes, like those on Venus and Mars, occur ____
a. over a hot spot b. along a subduction zone c. Inside a chamber d. along plate boundaries e. within a caldera
Fiber optics in a DVD player contain their light by employing total internal reflection. Designers surround the pure glass core with another type of glass, called cladding, that has a different index of refraction from the core.
How should you select a cladding?
A. Cladding must have a larger index of refraction than the core B. Cladding must have a smaller index of refraction than the core
Why do astronomers speak in terms of redshifts rather than distances to faraway objects?
What will be an ideal response?
If the result of your calculation of a quantity has SI units kg ? m2/(s2 ? C), that quantity could be
A) an electric field strength. B) a dielectric constant. C) an electric potential difference. D) a capacitance E) an electric potential energy.