In a metal that is not a superconductor, as the temperature approaches 0 K the electrical resistivity is due to free-electron scattering by:
(a) Structural defects
(b) Thermal vibrations
(c) Core electrons
(d) Nuclei
(a) Structural defects
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In a diagram of charges and electric field lines charge 
has twelve field lines going outward from it and charge 
has three field lines going into it. If one of the charges is 100 nC, what is the other one?
A. 25 nC B. 100 nC C. -25 nC D. -100 nC E. Both answers b and c can be correct.
In a star, the condition of balance between the inward force of gravity and the outward force of thermal and radiation pressure is known as ______________ equilibrium
Fill in the blank(s) with correct word
A force acting on a 2.00 kg object is given by F(x) = (2.00 N/m)x + (1.00 N/m3)x3. An object starts at rest at x = 1.00 m. What is speed of the object when it reaches x = 2.00 m?
A) 1.23 m/s B) 0.650 m/s C) 2.60 m/s D) 1.78 m/s E) The object does not reach 2.00 m because the increase in potential energy would imply a negative kinetic energy.
A 0.60-kg rock is swung in a circular path and in a vertical plane on a 0.25-m length string. At the top of the path, the angular speed is 12.0 rad/s. What is the tension in the string at that point?
a. 7.9 N c. 22 N b. 16 N d. 6.5 N