The most common mineral in Earth's crust is ________, and the second most common mineral is ________
A) quartz; feldspar
B) feldspar; quartz
C) silicate; carbonate
D) olivine; feldspar
Answer: B
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Two charges lie on the x axis, +3q at the origin, and ?2q at x = 5.0 m. The point on the x axis where the electric potential has a zero value (when the value at infinity is also zero) is
a. 1.0 m. b. 2.0 m. c. 2.5 m. d. 3.0 m. e. 4.0 m.
When is an elevator a reasonably good inertial reference frame?
A. Never, under any circumstances. B. Always, since it is attached to the surface of the earth. C. It is good except when it is changing speed. D. Other conditions (describe).
Many disk galaxies, such as Andromeda and the Milky Way, are thought to have extended halos of dark matter because the disk circular orbital speed is observed to ____________ increasing distances from the disk center
a. stay constant with b. decrease with c. be totally absent at
Automobile air bags reduce what during a collision?
A) speed of the automobile B) the forces exerted upon the passenger C) the kinetic energy transferred to the passenger D) the impulse exerted upon the passenger