How many electrons are transferred from iron atoms to oxygen atoms in the formation of two molecules of iron hydroxide, Fe(OH)2?
A) 4 electrons
B) 8 electrons
C) 16 electrons
D) 12 electrons
Answer: A
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Charge of a uniform density (8.0 nC/m2) is distributed over the entire xy plane. A charge of uniform density (3.0 nC/m2) is distributed over the parallel plane defined by z = 2.0 m. Determine the magnitude of the electric field for any point with z = 3.0 m.
A. 0.79 kN/C B. 0.17 kN/C C. 0.62 kN/C D. 0.34 kN/C E. 0.28 kN/C
Metal lids on glass jars can often be loosened by running them under hot water. Why is this?
a. The hot water is a lubricant. b. The metal and glass expand due to the heating, and the glass being of smaller radius expands less than the metal. c. The metal has a higher coefficient of thermal expansion than glass so the metal expands more than the glass, thus loosening the connection. d. This is just folklore.
Buoyancy: A barge is 10 m wide and 60 m long and has vertical sides. The bottom of the boat is 1.2 m below the water surface. What is the weight of the barge and its cargo, if it is floating in fresh water of density 1000 kg/m3?
A. 3.5 MN B. 6.4 MN C. 6.8 MN D. 7.1 MN E. 9.5 MN
How does an accretion disk around a neutron star differ from an accretion disk around a white dwarf?
A) The accretion disk around a neutron star is much hotter and emits higher-energy radiation. B) The accretion disk around a neutron star is made mostly of helium, while the accretion disk around a white dwarf is made mostly of hydrogen. C) The accretion disk around a neutron star is more likely to give birth to planets. D) The accretion disk around a neutron star always contains much more mass.