Direct detection of an extrasolar planet means ________
A) seeing the planet with the naked eye B) acquiring images or spectra of the planet
C) observing the planet's effect on its host star D) sending a space probe to the planet
B
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A(n) __________________ is one-3,600th of a degree
a. precession b. second of arc c. minute of arc d. nadir e. angular diameter
If the distance to the nearest star is 4.2 light-years, then
a. the star is 4.2 million AU away. b. the light we see left the star 4.2 years ago. c. the star must have formed 4.2 billion years ago. d. the star must be very young. e. the star must be very old.
The rate of flow of electric charge is
a. voltage. b. current. c. resistance. d. electric field. e. critical temperature.
A simple pendulum and a mass oscillating on an ideal spring both have period T in an elevator at rest. If the elevator now accelerates downward uniformly at 2 m/s2, what is true about the periods of these two systems?
A) Both periods would remain the same. B) Both periods would increase. C) Both periods would decrease. D) The period of the pendulum would increase but the period of the spring would stay the same. E) The period of the pendulum would decrease but the period of the spring would stay the same.