Which of the following materials has the highest dielectric constant?
A. air
B. Mylar
C. paper
D. Pyrex glass
E. water
Answer: E
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Reactance: What is the inductive reactance of a 2.50-mH coil at 1000 Hz?
A. 2500 ? B. 796 ? C. 15.7 ? D. 2.50 ?
The curved shape of Earth's shadow during an eclipse was evidence for ________.
A. a spherical Earth B. a flat, circular Earth C. a flat, circular Moon D. a spherical Moon E. None of these choices is correct.
What physical feature of Mars is atypical compared with the other terrestrial planets?
A) its size B) its atmospheric content C) its surface composition D) its density E) its rotation rate
Which of the following scenarios involves energy that we would typically calculate with Einstein's formula E = mc2?
A) A small amount of the hydrogen in a nuclear bomb becomes energy as fusion converts the hydrogen to helium. B) A burning piece of wood produces light and heat, therefore giving off radiative and thermal energy. C) A mass raised to a great height has a lot of gravitational potential energy. D) An object accelerated to a great speed has a lot of kinetic energy.