Which of these statements is true about the rotation of Earth?
a. Earth does not precess.
b. Precession only applies in conditions of gravity, so Earth cannot precess.
c. Earth is a slightly irregular sphere and precesses very slowly.
d. Earth is a very irregular imitation of a sphere, and precesses very fast.
e. Earth's North Pole has always pointed toward the star Polaris.
c
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How much mass must be converted to energy to release one million kilowatt hours?
A. 
B. 
C. 4.0 g
D. 
E. 40 pg
Charges q and Q are placed on the x axis at x = 0 and x = 2.0 m, respectively. If q = -40 pC and Q = +30 pC, determine the net flux through a spherical surface (radius = 1.0 m) centered on the origin
a. -9.6 N × m2/C b. -6.8 N × m2/C c. -8.5 N × m2/C d. -4.5 N × m2/C e. -1.1 N × m2/C
Process of Science: Explain how technology advances help address astronomical questions
What will be an ideal response?
Duff states that equal masses of all substances have equal changes in internal energy when they have equal changes in temperature. Javan states that the change in internal energy is equal to a constant times the change in temperature for every ?T, no matter how large or how small ?T is, but that the constant is different for different substances. Which one, if either, is correct?
a. Neither, because the specific heat depends on the substance and may vary with temperature. b. Neither, because a change of state may involve release or absorption of latent heat. c. Neither because a substance may do work during a temperature change. d. All of the statements above are correct. e. Only statements (a) and (b) are correct.