When we see a meteor shower, it means that
A) the solar wind is unusually strong.
B) an Earth-approaching asteroid has recently come very close to our planet.
C) you should duck and run for cover to avoid being blasted on the head by a rock from space.
D) Earth is crossing the orbit of a comet.
D
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Albedo changes may result from ______________ pollution
a. smog b. particulate c. gas d. noise
Phase equilibrium between the gaseous and liquid states describes the situation when
A) no more molecules leave the liquid and enter the gas. B) no more molecules leave the gas and enter the liquid. C) as many molecules go from liquid to gas as from gas to liquid. D) the liquid is boiling. E) None of the other choices is correct.
Phase Angles: At 1.00 kHz, the phase angle of an RLC series circuit with an inductive reactance of 200 ?, a resistance of 200 ? and a certain capacitor is 40.0°. What is the capacitance of the capacitor in this circuit?
A. 1.95 ?F B. 2.95 ?F C. 3.95 ?F D. 4.95 ?F E. 5.95 ?F
In a police rifle test, a 15-g bullet traveling 213 m/s in a vertical direction suddenly buries itself in a 2.4-kg block of wood at rest directly above it. As a result, the bullet-block combination moves vertically upward
(a) Determine the velocity of the bullet-block combination just after the impact. (b) Determine the maximum height reached by the bullet/block combination. (c) Is kinetic energy conserved in this collision?