Doppler shifted hydrogen absorption lines are seen in the spectrum of a star. The hydrogen line at 656.28 nm is seen to be shifted to 656.08 nm. Is the star moving towards or away from us, or can we not tell?
A) moving away from us
B) moving towards us
C) There is not enough information to determine the answer.
B
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Mercury's major atmospheric gas is
a. oxygen. b. hydrogen. c. carbon dioxide. d. Misleading; the atmosphere is virtually nonexistent.
RC Circuits: An uncharged capacitor is connected in series with a resistor, a dc battery, and an open switch. At time t = 0 s, the switch is closed. Which of the graphs below best describes the potential difference V across the capacitor as a function of time t?
A. A B. B C. C D. D E. E
In cold weather, your hands will be warmer if you wear
A) gloves. B) mittens. C) both the same
An object drops in free fall. At one instant it is moving at a speed of 50 meters per second. Exactly one second later its speed is about
1) 10 m/s. 2) 50 m/s. 3) 60 m/s. 4) 100 m/s. This is because 5) no net force acts on the object while in its state of free fall. 6) it gains a speed of about 10 m/s for each second of fall. 7) its velocity nearly doubles each second.