Two steel wires are stretched with the same tension. The first wire has a diameter of 0.610 mm and the second wire has a diameter of 0.910 mm
If the speed of waves traveling along the first wire is 54.0 m/s, what is the speed of waves traveling along the second wire?
A) 24.9 m/s
B) 27.2 m/s
C) 36.2 m/s
D) 81.0 m/s
E) 100 m/s
C
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The graphs below represent current and voltage phasors at one instant of time. The solid arrows represent the voltage phasors, ?Vmax, and the dashed arrows represent the current phasors, Imax. Which graph shows the correct relationship between current and voltage phasors for a capacitor in an RC circuit?
a.
b.
c.
Assume the amplitude of the electric field in a plane electromagnetic wave is E1 and the amplitude of the magnetic field is B1. The source of the wave is then adjusted so that the amplitude of the electric field doubles to become 2E1. What happens to the intensity of the wave?
1.It becomes four times larger. 2.It becomes two times larger. 3.It can stay constant. 4.It becomes one-half as large. 5.It becomes one-fourth as large.
Kinetic energy is conserved in __________ collisions
Fill in the blank(s) with correct word
Isaac Asimov, noted popularizer of science and science fiction author, has addressed overpopulation: "democracy cannot survive overpopulation. Human dignity cannot survive [overpopulation]. Convenience and decency cannot survive [overpopulation]
As you put more and more people onto the world, the value of life not only declines, it disappears. It doesn't matter if someone dies, the more people there are, the less one person matters." Respond to Asimov's statement by discussing any evidence available.