Cosmic rays impinging upon the earth will generally ____
a. be deflected by the earth's gravitational field
b. not be affected if they are electrically neutral
c. be weaker in intensity at the earth's poles
d. lead to lightning discharges in the atmosphere
b
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Why do we see essentially the same face of the Moon at all times?
A) because the other face points toward us only at new moon, when we can't see the Moon B) because the Moon does not rotate C) because the Moon's rotational and orbital periods are equal D) because the Sun illuminates only one half of the Moon at a time E) because the Moon has a nearly circular orbit around Earth
_______________ theoretical assumptions on quantization overcame the difficulty with a major problem with understanding blackbody radiation.
A. Hertz's B. Planck's C. Einstein's D. Maxwell's E. Bohr's
AC Generator: A circular coil with 600 turns has a radius of 15 cm. The coil is rotating about an axis perpendicular to a magnetic field of 0.020 T. If the maximum induced emf in the coil is 1.6 V, at what angular frequency is the coil rotating?
A. 0.30 rad/s B. 0.60 rad/s C. 0.90 rad/s D. 1.4 rad/sec E. 1.9 rad/s
A long, straight, horizontal wire carries current toward the east. A proton moves toward the east alongside and just south of the wire. What is the direction of the magnetic force on the proton?
A) toward the north B) toward the south C) upward D) downward E) toward the east.