What makes the Crab Nebula pulsar unusual among other pulsars?
A) It is a magnetar, with far more intense magnetic fields than any other.
B) It is the oldest known pulsar.
C) Its period is much less regular than other pulsars.
D) It is the fastest spinning known pulsar.
E) It is relatively bright in shorter wavelengths, like visible and X-rays.
E
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A flashlight, which uses two 1.5 V batteries in series, is turned on for 2.0 minutes. If the current in the flashlight is 100 mA, what is the energy dissipated?
A. 12 J B. 9.0 J C. 72 J D. 36 J E. 18 J
The Sun makes most of its energy by the proton-proton cycle
a. True b. False Indicate whether the statement is true or false
Which properties affect the location of the habitable zone?
A. Star size B. Exoplanet semi-major axis C. Number of exoplanets in the system D. All of these choices are correct. E. None of these choices are correct.
It's hot as blue blazes outside so you stand in front of your refrigerator with the door open to cool off. If you stand there long enough,
A. the room will eventually get colder. B. the room will stay the same temperature. C. the room will eventually get warmer.