In some countries the AC frequency is 50 Hz. What is the time interval for one cycle at this frequency?
a. 0.0050 s
c. 2 s
b. 0.020 s
d. 50 s
B
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The baryon having which of the following quark contents is electrically neutral?
A. dds B. bbc C. uud D. ucs
An 80-g aluminum calorimeter contains 380 g of water at an equilibrium temperature of 20°C. A 120-g piece of metal, initially at 352°C, is added to the calorimeter. The final temperature at equilibrium is 32°C
Assume there is no external heat exchange. The specific heats of aluminum and water are 910 J/kg•K and 4190 J/kg•K, respectively. The specific heat of the metal is closest to A) 520 J/kg ? K. B) 480 J/kg ? K. C) 390 J/kg ? K. D) 350 J/kg ? K. E) 560 J/kg ? K.
By convention, the direction of current in a circuit is
A) from the positive terminal of a source to the negative terminal. B) the direction in which positive charge flows. C) both of these D) neither of these
The zonal flows giving rise to the belts and zones are similar to the jet streams in our own stratosphere
Indicate whether the statement is true or false