The bond energy of a pair of atoms is equal to the depth of the interatomic potential at the ______________interatomic separation.
Fill in the blank(s) with the appropriate word(s).
equilibrium
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The Sun is on the celestial equator at the times of the
a. vernal equinox and the summer solstice. b. autumnal equinox and the vernal equinox. c. summer solstice and the winter solstice. d. autumnal equinox and the winter solstice. e. Sun is on the ecliptic and is never on the celestial equator.
A composite beam of aluminum (Ea 5 72 GPa) and steel (Es 5 190 GPa) has a width b 5 25 mm and heights ha 5 42 mm and hs 5 68 mm, respectively. A bending moment is applied about the z axis resulting in a maximum stress in the aluminum of 55 MPa. The maximum stress in the steel is approximately:
(A) 86 MPa
(B) 90 MPa
(C) 94 MPa
(D) 98 MPa
In the formula E = mc2, what does E represent?
A) the mass-energy, or potential energy stored in an object's mass B) the kinetic energy of a moving object C) the radiative energy carried by light D) the gravitational potential energy of an object held above the ground E) the electric field produced by a charge
For finding the distances to globular clusters, Harlow Shapley used
A) RR Lyrae variables. B) planetary nebulae. C) eclipsing binaries. D) Population I classical Cepheids. E) Type I supernovae.