Two wires, one copper and the other steel, of equal length stretch the same amount under an applied load P. The moduli of elasticity for each is Es 5 210 GPa and Ec 5 120 GPa. The ratio of the diameter of the copper wire to that of the steel wire is approximately:
(A) 1.00
(B) 1.08
(C) 1.19
(D) 1.32
(D) 1.32
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The discovery of electromagnetic induction is credited to
A) Joseph Henry in America. B) Michael Faraday in England. C) both of these D) neither of these
Imagine that an electron had a spin of 5/2 so that its spin quantum number, ms, could have the following six values: ms = +5/2, +3/2, +1/2, –1/2, –3/2, and –5/2 . If this were true, the first element with a filled shell would be
a. He with 2 electrons. b. Be with 4 electrons. c. C with 6 electrons. d. O with 8 electrons.
What is true of an element of atomic number 15 that has an isotope of mass number 32? (There could be more than one correct choice.)
A) the number of protons in the nucleus is 15. B) the number of neutrons in the nucleus is 17. C) the number of protons in the nucleus is 32. D) the number of neutrons in the nucleus is 15. E) the number of nucleons in the nucleus is 47.
Two resistors of values 6.0 and 12.0 W are connected in parallel. This combination in turn is hooked in series with a 4.0-W resistor and a 24-V battery. What is the current in the battery?
a. 12 A c. 2.0 A b. 3.0 A d. 6.0 A