About 85% by mass of Earth's core is composed of the element(s)
a. iron
b. nickel
c. oxygen.
d. silicon.
e. iron and nickel.
a
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Melanie says that when a diver enters an underwater cave of height h, the pressure on her is no greater than ?Wgh. Rosalind says that if the bottom of the cave is a distance H below the water surface, the pressure on the soles of the diver's feet can reach ?WgH. Which one, if either, is correct? (The density of water is ?W.)
a. Melanie, because the roof of the cave absorbs the water pressure from above. b. Melanie, because only the fluid directly above any volume of the fluid can contribute to the pressure on that volume. c. Rosalind, because a fluid exerts equal pressure in all directions at a given depth. d. Rosalind, because the pressure also depends on the density, ?c, of the material above the cave roof, so that p = ?cg(H ? h) + ?Wgh. e. Melanie, because the pressure equals p = ?WgH ? ?cg(H ? h).
When the number of turns in a solenoid and its length are both doubled, the ratio of the magnitude of the new magnetic field inside to the magnitude of the original magnetic field inside is what?
A. 0.25 B. 0.50 C. 1 D. 2 E. 4
Work: You throw a baseball straight up. Compare the sign of the work done by gravity while the ball goes up with the sign of the work done by gravity while it goes down.
A. The work is positive on the way up and positive on the way down. B. The work is positive on the way up and negative on the way down. C. The work is negative on the way up and positive on the way down. D. The work is negative on the way up and on the way down because gravity is always downward.
Which of these lists is in order of increasing wavelength?
A. First harmonic, second harmonic, fundamental B. Third harmonic, second harmonic, first harmonic C. Second harmonic, third harmonic, fourth harmonic D. First harmonic, second harmonic, third harmonic