Annealed polycrystalline low-carbon iron has a tensile yield strength of
(a) Estimate the dislocation density of the cold-rolled iron.
(b) You must make some assumptions to solve this problem. Justify your assumptions.
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Two protons added to an oxygen nucleus produce
A) heavy oxygen. B) fluorine. C) neon. D) sodium. E) nitrogen.
Which of the following principles explains why guns recoil?
A) Conservation of momentum. B) Conservation of energy. C) The law of inertia. D) Newton's law of motion. E) None of the above.
Two parallel wires are separated by 0.25 m. Wire A carries 5.0 A and Wire B carries 10 A, both currents in the same direction. The force on 0.80 m of Wire A is:
a. half that on 0.80 m of wire B. b. one-fourth that on 0.80 m of wire B. c. toward Wire B. d. away from Wire B.
When a hydrogen electron is in its first excited state, its principal quantum number is
a. zero. b. 2. c. –13.60 eV. d. 1.