What are the SI units of momentum?
a. kg m/s b. pascals
c. joules d. watts
a
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North-zenith-south line which divides the sky into two halves
Which expands more when the temperature is lowered? Equal volumes of
A) iron. B) wood. C) helium. D) water at 4°C. E) none expand when the temperature is lowered
When a capacitor is fully charged, the current through the capacitor in a direct-current circuit is
a. zero. b. at its maximum value. c. equal to the current in a resistive circuit in parallel with the capacitor circuit. d. greater than the current in a resistor that is farther from the battery than the capacitor. e. zero if it is the only capacitor, but maximum if there is another capacitor in series with it.
The best evidence for the existence of supermassive black holes is
A) very high orbital velocities in a very compact region. B) evidence for jet velocities that approach the speed of light. C) large quantities of high-energy emission such as X-rays and gamma rays, and radio emission from relativistic electrons. D) huge dark regions in the centers of galaxies, where black holes have been sucking in the galaxy from the inside out.