The ground state electronic configuration for silicon is 1s22s22p63s23p2 . Which of the following elements would be expected to be chemically similar to silicon?
a. boron with configuration 1s22s22p1
b. lithium with configuration 1s22s1
c. carbon with configuration 1s22s22p2
d. sodium with configuration 1s22s22p63s1
C
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Two parallel wires are separated by 0.25 m. Wire A carries 4.1 A and Wire B carries 10 A, both currents in the same direction. The magnetic permeability in empty space µ0 = 4p × 10^-7 T×m/A. The magnitude of the force on 1.4 m of Wire A is:
a. 2.6 × 10^–5 N. c. less than 1.0 × 10^–5 N. b. 4.6 × 10^–5 N. d. 3.2 × 10^–5 N.
Consider a pipe of length L that is open at both ends. What are the wavelengths of the three lowest-pitch tones produced by this pipe?
A) 4L, 2L, L B) 2L, L, L/2 C) 2L, L, 2L/3 D) 4L, 4L/3, 4L/5 E) 4L, 2L, L/2
Eta Carinae is an example of a:
A) black hole. B) supermassive star. C) red dwarf. D) nebula. E) stellar nursery.
An ore car of mass 4 900 kg rolls downhill on tracks from a mine. At the end of the tracks, 13.5 m lower in elevation, is a spring with k = 410 000 N/m. How much is the spring compressed in stopping the ore car? Ignore friction
a. 1.26 m b. 0.889 m c. 1.78 m d. 0.568 m e. 0.484 m