Comets are composed of ____
a. rock and dust
b. rock and metals
c. ice and metals
d. ice and dust
e. rock and gas
d
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A point charge +Q is located on the x axis at x = a, and a second point charge ?Q is located on the x axis at x = ?
a. A Gaussian surface with radius r = 2a is centered at the origin. The flux through this Gaussian surface is a. zero because the negative flux over one hemisphere is equal to the positive flux over the other. b. greater than zero. c. zero because at every point on the surface the electric field has no component perpendicular to the surface. d. zero because the electric field is zero at every point on the surface. e. none of the above.
What are the two longest stages in the life of a one solar mass star?
a. Protostar, pre-main sequence. b. Protostar, white dwarf. c. Protostar, main-sequence. d. Main-sequence, white dwarf.
The equilibrium rule states that the vector sum of all forces acting on a
A) body at rest is zero. B) body in uniform motion is zero. C) non-accelerating body is zero. D) all of the above
Total Internal Reflection: Light enters a substance from air at 30.0° to the normal. It continues within the substance at 23.0° to the normal. What is the critical angle for this substance when it is surrounded by air?
A. 53° B. 51.4° C. 36.7° D. 12.6°