A long thin rod of length L has a linear density ?(x) = Ax where x is the distance from the left end of the rod. (a) How far is the center of mass of the rod from the left end of the rod? (b) What is the mass of the rod?
What will be an ideal response?
Answer: (a) 2L/3 (b) AL2/2
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Charge in an Electric Field: An electron is initially moving to the right when it enters a uniform electric field directed upwards, as shown in the figure. Which trajectory (X, Y, Z, or W) will the electron follow in the field?
A. trajectory W B. trajectory X C. trajectory Y D. trajectory Z
Which of the following describes erosion?
A) the excavation of bowl-shaped depressions by asteroids or comets striking a planet's surface B) the eruption of molten rock from a planet's interior to its surface C) the disruption of a planet's surface by internal stresses D) the wearing down or building up of geological features by wind, water, ice, and other phenomena of planetary weather
The United States is one of the least expensive places to build a power facility
What will be an ideal response?
Under what circumstances would a nonzero vector lying in the xy plane have components that are equal in magnitude?
1.This can never happen. 2.Always. Components of vectors are always equal in just two dimensions. 3.Only when the vector lies on the x- or y-axes (0°, 90°, 180°, or 270°). 4.Only when the vector lies 45° from the x- or y-axes (45°, 135°, 225°, or 315°).