When a well is drilled into an aquifer, why does water flow out of the well spontaneously?
What will be an ideal response?
Answer: The well is drilled in an artesian system where water is brought up to the surface under its own internal pressure. For an artesian system to form, the well must be drilled where the elevation of the ground surface is lower than the elevation of the water table in the aquifer at the recharge area.
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Planetary transits of exoplanets are rare because
A) most stars are too bright for us to detect a planetary transit. B) the Earth's atmosphere interferes with our observations of transits. C) our telescopes are not powerful enough to detect them. D) most extrasolar systems are not seen edge-on. E) most exoplanets are smaller than Pluto.
Three particles are placed in the xy plane. A 40-g particle is located at (3, 4) m, and a 50-g particle is positioned at (?2, ?6) m. Where must a 20-g particle be placed so that the center of mass of this three-particle system is located at the origin?
A. (?1, ?3) m B. (?1, 2) m C. (?1, 12) m D. (?1, 7) m E. (?1, 3) m
A double-slit experiment uses light of wavelength 633. nm with a slit separation of 0.100 mm and a screen placed 2.0 m away
(a) What is the linear width of the central fringe? (b) What is the lateral distance between 1st and 2nd order fringes? (c) What is the angular separation between the central maximum and the 1st order maximum?
How can we best observe the Sun's chromosphere and corona?
A) The chromosphere is best observed with infrared telescopes and the corona is best observed with ultraviolet telescopes. B) The chromosphere is best observed with ultraviolet telescopes and the corona is best observed with X-ray telescopes. C) The chromosphere and corona are both best studied with radio telescopes. D) The chromosphere and corona are both best studied with visible light.