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?
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At t = 0, a wheel rotating about a fixed axis at a constant angular acceleration of ?0.40 rad/s2 has an angular velocity of 1.5 rad/s and an angular position of 2.3 rad. What is the angular position of the wheel at t = 2.0 s?
A. 4.9 rad B. 4.7 rad C. 4.5 rad D. 4.3 rad E. 4.1 rad
If a 500-W heater carries a current of 4.00 A, what is the resistance of the heating element?
a. 85.7 ? b. 42.8 ? c. 31.3 ? d. 11.2 ?
A 6.1-kg solid sphere, made of metal whose density is 2600 kg/m3, is suspended by a cord. When the sphere is immersed in a liquid of unknown density, the tension in the cord is 26 N. Find the density of the liquid
A) 1500 kg/m3 B) 1400 kg/m3 C) 1300 kg/m3 D) 1200 kg/m3 E) 1100 kg/m3
Schroedinger's equation enables scientists to predict
A) the statistical pattern formed by impacts of large numbers of microscopic particles. B) the matter wave for a microscopic particle. C) Both of the above. D) the exact path followed by a microscopic particle. E) All of the above.