The amount of current in a CFL rated 23W 120V is about
A) 0.2A.
B) 5.2A.
C) more than 5.2A.
Answer: A
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A 10-L flask and a 1-L flask each contain two moles of ideal diatomic gas (but not the same gas) at 25°C. Which of the following statements about these gases must be true? (There could be more than one correct choice.)
A) The internal (thermal) energy of the gas in both flasks is the same. B) The internal (thermal) energy of the gas in the larger flask is greater than the internal (thermal) energy of the gas in the smaller flask. C) The internal (thermal) energy of the gas in the smaller flask is greater than the internal (thermal) energy of the gas in the larger flask. D) The molecules in the larger flask have the same root-mean-square speed as those in the smaller flask. E) The molecules in the smaller flask have the same average kinetic energy per molecule as those in the larger flask.
When a switch is closed to complete a DC series RL circuit,
A. the electric field in the wires increases to a maximum value. B. the magnetic field outside the wires increases to a maximum value. C. the rate of change of the electric and magnetic fields is greatest at the instant when the switch is closed. D. all of the above are true. E. only (a) and (c) above are true.
A high-diver of mass 59.8 kg jumps off a board 10.0 m above the water. If, 1.00 s after entering the water his downward motion is stopped, what average upward force did the water exert?
a. 108 N b. 4.27 N c. 840 N d. 598 N e. None of the other answers is correct.
What spectral type of star that is still around formed longest ago?
A) O B) A C) F D) K E) M