If the net force on a cart is tripled, the cart's acceleration
A) is one third.
B) is two thirds.
C) is three times as much.
D) is more than three times as much.
Answer: C
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In a scientific presentation, an author stated that FCC metals melt when there is on the average one vacancy in the atom positions surrounding each atom
(a) Check the validity of this statement for copper by comparing the vacancy concentration when there is one vacancy in the atom positions surrounding each atom with the equilibrium vacancy concentration in copper at the melting temperature of copper (1356 K). The vacancy formation enthalpy in copper is 1.0 eV per vacancy. (b) Calculate the entropy of mixing the equilibrium number of vacancies into a copper crystal at the melting temperature, with a total number of crystal sites equal to 1 mole. (c) Calculate the change in the Gibbs free energy when the equilibrium number of vacancies forms relative to that of a perfect crystal with 1 mole of total sites.
A brass plate measures 30.0 cm by 40.0 cm. The coefficient of linear thermal expansion is 
If the temperature of the plate is increased by 10.0 K, then what is the increase in the area of the plate?
A. 0.350 cm2 B. 0.404 cm2 C. 0.456 cm2 D. 0.502 cm2 E. 0.555%
A diver shines light upward to the surface of a smooth pond at 20° to the normal. Most light passes into the air above while the part that reflects back into the water makes an angle to the normal of
A) less than 20°. B) 20°. C) more than 20°. D) all refracts, none reflects.
For n = 6, what are the maximum orbital quantum number and the maximum orbital magnetic quantum number?
a. 7, 6 c. 6, 5 b. 5, 4 d. 5, 5