The best site for placing an X-ray telescope is ________.
A. a valley
B. above Earth's atmosphere
C. a desert
D. near an ocean
E. a mountaintop
Answer: B
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Both Newton and Kepler considered forces on the planets. Kepler mistakenly hypothesized the direction of the forces to be
A) along their directions of travel. B) perpendicular to their directions of travel. C) toward the Sun. D) none of the above
Find the resonant frequency for a series RLC circuit where R = 10 ?, C = 5.00 ?F, and L = 2.00 mH.
A. 998 Hz B. 1.59 kHz C. 2.45 kHz D. 11.3 kHz E. 2.53 kHz
On a cold day, a piece of metal feels much colder to the touch than a piece of wood. This is due to the difference in which one of the following physical properties of these materials?
A) density B) specific heat C) emissivity D) thermal conductivity E) mass
For normal vision, an object can be seen clearly when it is beyond the
a. far point. b. nearsighted point. c. farsighted point. d. near point.