How fast is a galaxy at a distance of 3000 Mpc receding from us?
A: 216,000 km/s
B: 3000 km/s
C: 2400 km/s
D: 24 km/s
E: 24,000 km/s
Ans: A: 216,000 km/s
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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?
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Answer the following statement true (T) or false (F)
What is the size of an object located at a distance of 1,000 meters and that has angular size A = 4 degrees?
A. about 4,000 meters B. about 11 meters C. about 35 meters D. about 70 meters
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