An object is thrown vertically into the air. In this case air resistance affects motion. Compared with its time for ascent, the time for its descent is
A) shorter.
B) the same.
C) longer.
D) need more information
Answer: C
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Assume that the brightness of an ohmic light bulb with resistance R is directly proportional to the power it dissipates. If we connect it to the plates of a charged capacitor with capacitance C at time t = 0, by what factor is it dimmer at time t = 2RC than its initial brightness?
A. 1/2 B. 1/4 C. 1/2e D. 1/e2 E. 1/e4 F. Some other factor (specify)
Our current theories are unable to describe the conditions of the universe during the Planck era. About how long after the Big Bang did the Plank era end?
A) 10-10 second B) 10-35 second C) 10-43 second D) 3 minutes E) 380,000 years
Which of the following statements about spectral types of stars is true?
A) The spectral type of a star can be used to determine its surface temperature. B) A star with spectral type A is cooler than a star with spectral type B. C) A star with spectral type F2 is hotter than a star with spectral type F3. D) The spectral type of a star can be used to determine its color. E) All of the above are true.
A light bulb used in a slide projector draws a current of 6 amperes when operating on 120 volts.If two slide projectors are connected in series across the same 120-volt source, the current drawn from the source is __________
Fill in the blank(s) with correct word