The primary purpose of adding chromium to stainless steel is to improve the resistance to _________.
Fill in the blank(s) with the appropriate word(s).
corrosion
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A satellite is in a circular orbit about the Earth at a distance of two Earth radii above the surface. What is the speed of the satellite? (The radius of the Earth is 6.4 × 10^6 m, and G = 6.67 × 10^?11 N × m2/kg2.)
a. 2 800 m/s b. 4 600 m/s c. 5 600 m/s d. 17 000 m/s
Which of the following statements about neutrinos is not true?
A) About a thousand trillion neutrinos are passing through your body every second. B) Neutrinos are created as a by-product of the proton-proton chain. C) Neutrinos have no electrical charge. D) Neutrinos have a tendency to pass through just about anything without interactions, making them very difficult to detect. E) The mass of a neutrino is 30 percent of the mass of an electron.
If a convex lens were made out of very thin clear plastic filled with air, and were then placed underwater where n = 1.33 and where the lens would have an effective index of refraction n = 1, the lens would act in the same way
A. as a concave mirror in air. B. as a concave lens in air. C. as a convex lens in air. D. as a flat refracting surface between water and air as seen from the water side. E. as the glasses worn by a farsighted person.
Reasoning from the fact that it is difficult to pull a nucleus apart, we can conclude that the nuclear force must
A) be attractive and very strong. B) have a very short range. C) have a very long range. D) operate only between neutrons, and not between protons. E) be repulsive and very strong.