The evidence favors a universe whose overall geometry is
A) closed. B) flat. C) cylindrical. D) open. E) circular.
B
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Assume that an interionic pair potential between K+ and Cl– ions can be approximated by Equation 2.15. Assume that the repulsive ion core interactions can be modeled with a power of m=12. Experimentally it has been determined that the energy to separate one pair of K+ and Cl– ions is 5.0 eV, and that the equilibrium interionic separation is equal to 0.266 nm. Use this experimental data to determine the value of B for an ion pair. Use the SI system of units for this problem.
What will be an ideal response?
The star Wolf 359 is 7.7 light years away. What is that distance in kilometers?
a. 7.7 x 10^8 km b. 14 x 10^13 km c. 0.78 x 10^8 km d. 7.28 x 10^13 km e. 7.28 x 10^12 km
At what point do the weak nuclear and electromagnetic forces split?
A) never, they are still united B) at 1012 K, when pair production starts for neutrons and protons C) at 10-43 seconds, when all four forces separate as the Planck Era ends D) at about four seconds, when at millions of degrees hydrogen forms helium E) after about 10-10 seconds, when the temperature drops below 10-15 K
A charge Q is uniformly distributed along the x axis from x = a to x = b. If Q = 45 nC, a = ?3.0 m, and b = 2.0 m, what is the electric potential (relative to zero at infinity) at the point, x = 8.0 m, on the x axis?
a. 71 V b. 60 V c. 49 V d. 82 V e. 150 V