A neutral atom has electron configuration 1s22s22p63s23p2. What element is this?
A)
carbon
B)
iron
C)
nitrogen
D)
silicon
E)
germanium
D
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Which of these is/are not true of nuclear fission reactors?
a. Their intended output is heat. b. They produce the majority of the electric energy used in the world. c. There is a small chance one could explode like an atom bomb. d. Some can produce or "breed" more nuclear fuel than they consume.
Charge of uniform density 90 nC/m3 is distributed throughout the inside of a long nonconducting cylindrical rod (radius = 2.0 cm). Determine the magnitude of the potential difference of point A (2.0 cm from the axis of the rod) and point B (4.0 cm from the axis)
a. 1.9 V b. 1.4 V c. 2.2 V d. 2.8 V e. 4.0 V
If a person in Alaska were locked out of his house on a day when the temperature outside was ?40°C, his thick clothing would mostly reduce the loss of thermal energy by
a. conduction. b. convection. c. radiation. d. all of the above. e. convection and radiation.
A 4.0-mH coil carries a current of 5.0 A. How much energy is stored in its magnetic field?
A) 10 mJ B) 2.0 mJ C) 20 mJ D) none of the given answers