A charge of 4.0 nC is distributed uniformly along the x axis from x = +4 m to x = +6 m. Which of the following integrals is correct for the electric potential (relative to zero at infinity) at the origin?
A.
B.
C.
D.
E.
Answer: C
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An object when orbiting the Earth at a height of three Earth radii from the center of the Earth has a weight of 2.0 N. What is the object's mass? (g at the surface of the Earth is 9.80 m/s2)
a. 0.22 kg b. 18 kg c. 1.8 kg d. 0.46 kg
A cube is 1.0 inch in length on the side (1 in = 2.540 cm). The volume of the cube is
a. 
b. 
c. 
d. 
What is the power of a lens that has a focal length of -40 cm and a width of 2.0 cm?
A) -2.5 diopters B) -0.50 diopters C) +2.5 diopters D) +4.0 diopters E) -50 diopters
Classical theory predicts that the planets can orbit the Sun quite stably
Why could not stable orbits be predicted for the atom by simply substituting the electrical attraction for the gravitational attraction? Why was there a classical crisis in describing the atom?