Reduced tempatures and growing seasons in Europe following the 1783 Laki eruption were primarily caused by
a) blocking of sunlight by volcanic ash and aerosols
b) blanketing of the ground with thick layers of ash
c) cold glacial meltwater entering the northern Atlantic in massive quantities
Answer: a) blocking of sunlight by volcanic ash and aerosols
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In a ferroelectric material, the cycle from saturation in the positive direction, to saturation in the negative direction, to saturation in the positive direction again is a(n) _________loop.
Fill in the blank(s) with the appropriate word(s).
A buoy, used to mark a harbor channel, consists of a weighted rod 2.00 m in length. 1.50 m of the rod is immersed in water and 0.500 m extends above the surface
If sunlight is incident on the water with an angle of incidence of 40.0°, what is the length of the shadow of the buoy on the level bottom of the harbor?
An astronaut in an inertial reference frame measures a time interval ?t between her heartbeats. What will observers in all other inertial reference frames measure for the time interval between her heartbeats?
A) ?t B) more than ?t C) less than ?t D) The answer depends on whether they are moving toward her or away from her.
An observer stands 3 m from speaker A and 4 m from speaker B. Both speakers, oscillating in phase, produce 170-Hz waves. The speed of sound in air is 340 m/s. What is the phase difference (in radians) between the waves from A and B at the observer's location, point P?
?
?
a.
0
b.
?/2
c.
?
d.
2?
e.
4?