When water boils, its temperature
a. increases. b. decreases.
c. stays constant. d. cannot be determined.
c
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Which of the following is not a characteristic of the 11-year sunspot cycle?
A) The sunspot cycle is steady, so that each 11-year cycle is nearly identical to every other 11-year cycle. B) The likelihood of seeing solar prominences or solar flares is higher when sunspots are more common and lower when they are less common. C) The Sun's entire magnetic field flip-flops with each cycle, so that the overall magnetic cycle averages 22 years. D) The number of sunspots on the Sun at any one time gradually rises and falls, with an average of 11 years between the times when sunspots are most numerous.
A certain transformer doubles input voltage. If the primary coil draws 10 A of current, then the current in the secondary coil is
A) 2 A. B) 5 A. C) 10 A. D) 25 A. E) none of the above
In winter, light-colored clothes will keep you warmer than dark-colored clothes if
a. you are warmer than your surroundings. b. you are at the same temperature as your surroundings. c. you are cooler than your surroundings. d. you are standing in sunlight.
A 60.0-kg man stands at one end of a 20.0-kg uniform 10.0-m long board. How far from the man is the center of mass (or center of gravity) of the man-board system?
A) 1.25 m B) 2.50 m C) 5.00 m D) 7.50 m E) 9.00 m