How deep is an impact crater compared to its width?
A) 1-10% B) 50-100% C) 30-40% D) 10-20% E) 100-200%
D
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Find the energy in MeV released in the reaction: U ? Th + He Mass of 238U = 238.050786 u Mass of 234Th = 234.043583 u Mass of 4He = 4.002603 u
What will be an ideal response?
A 1.0 ?F capacitor has a potential difference of 6.0 V applied across its plates. If the potential difference across its plates is increased to 8.0 V, how much ADDITIONAL energy does the capacitor store?
A) 14 ?J B) 28 ?J C) 2.0 ?J D) 4.0 ?J
Melanie says that when a diver enters an underwater cave of height y, the pressure on her is no greater than ?Wgy. Rosalind says that if the bottom of the cave is a distance Y below the water surface, the pressure on the soles of the diver's feet can reach ?WgY. 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 ?c, density of the material above the cave roof, so that p = ?cg(Y ? y) + ?Wgy. e. Melanie, because the pressure equals p = ?WgH ? ?cg(H ? h).
The wave-related quantity algebraically equivalent to 1/f is:
a. c. A b. T d.