Which of the following is true of Galileo Galilei?
A) He invented the telescope.
B) He publically defended the geocentric model of the Universe.
C) He was the first person to look at the sky through a telescope.
D) He applied his careful observations of the sky to determine the place of Earth.
D
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It takes 10 J of work to push a charge into an electric field. Relative to its starting position it has gained a potential energy of
A) less than 10 J. B) 10 J. C) more than 10 J. D) none of the above
What are four key features of our solar system that any theory of solar system formation must be able to explain?
a. The Sun generates energy through fusion of hydrogen into helium.} b. There are clear patterns to the rotation and orbits of large bodies in the solar system. c. There are vast numbers of asteroids and comets. d. Planets fall into two major categories. e. There are a few notable “exceptions to the rules.” f. The solar nebula collapsed due to gravity.
A very loud train whistle has an acoustic power output of 80 W. If the sound energy spreads out spherically, what is the intensity level in dB at a distance of 100 meters from the train? (I0 = 10-12 W/m2)
a. 78.3 dB c. 92.8 dB b. 88.0 dB d. 95.0 dB
A three-cell flashlight has 3 batteries in series each with an emf of 1.5 V. If the bulb has a resistance of 50 
what current is flowing when the flashlight is operating? (Assume the internal resistance of the batteries is negligible.)
A. 30 mA B. 10 mA C. 27 mA D. 90 mA E. 11 A