Energy and Mass: In a nuclear plant, 1017 J of energy is available from mass conversion. How much mass of fuel was lost to produce this energy? (c = 3.0 × 108 m/s)
A. 0.1 kg
B. 1 kg
C. 10 kg
D. 100 kg
Answer: B
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An iron bolt is galvanized with a coating of zinc 0.03 cm (0.012 in) thick to protect the iron in a saltwater environment. The bolt has an area of 2 cm2 and is used to secure an iron plate with an area of 100 cm2 that is exposed to saltwater. In an experiment in seawater with a zinc coated iron anode of 2 cm2 and an iron plate cathode with an area of 100 cm2 a corrosion current of 2 mA is measured. Predict the expected lifetime in years or days of the zinc coating in this application assuming that the zinc coating is uniformly corroded and that the current efficiency is 100 %.
What will be an ideal response?
A force of 10.0 N is applied to a wire with an un-stretched length of 4.00 m and a diameter of 5.00 mm. If the wire changed length by 1.20 mm, then the stress in the wire is
a. 
b. 
c. 
d. 
e. 
Silver has a Fermi level of 5.5 eV. At 0 K, what is the speed of the electrons with the Fermi speed?
A) 1.4 × 106 m/s B) 1100 m/s C) 2200 m/s D) 0 E) 1.1 × 106 m/s
Astronomers measured the location of the Sun in the Milky Way Galaxy by
A. counting the number of stars. B. plotting the position of O and B stars. C. plotting the position of globular star clusters. D. plotting distribution of water molecules.