The magnetic field in a superconducting solenoid is 3.0 T. How much energy per unit volume is stored in the solenoid, in J/m3? m0 = 4p × 10^-7 T × A/m
3.6 × 10^6 J/m3
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(From a science quiz that appeared in the weekly magazine The Economist.) Economic history is easier to write than the history of the universe
Nevertheless, most cosmologists now think that when the universe was formed in which of the following manners? A) First there was a Big Bang, then inflation (of space) caused recession (of all matter, away from the Big Bang). B) First there was inflation, which caused the Big Bang, then recession. C) First there was a Big Bang. There has not been any inflation yet, but if it comes it will cause recession.
A car is moving with a constant acceleration. At time t = 5.0 s its velocity is 8.0 m/s in the forward direction, and at time t = 8.0 s its velocity is 12.0 m/s forward. What is the distance traveled in that interval of time?
A) 40 m B) 30 m C) 20 m D) 50 m E) 10 m
The image of our galaxy in radio emission from CO, mapping the distribution of molecular clouds, is closest to the image of our galaxy in
A) 21-cm-line radio emission from atomic hydrogen. B) visible light, showing the edges of supernova bubbles. C) visible light, which is closest to how the night sky appears from Earth. D) X-rays from hot gas bubbles in the disk. E) infrared emission from interstellar dust grains.
The Sun projects charged particles into space, giving rise to a flow of radiation called the
a. heliosphere. b. solar wind. c. corona. d. chromosphere.