What is a new moon?
a. The lunar phase in which the first quarter Moon approaches full moon
b. The lunar phase in which Earth's shadow is cast on the Moon
c. The lunar phase in which the Moon's shadow is cast on Earth
d. The lunar phase in which sunlight illuminates only the far side of the Moon
e. The lunar phase in which sunlight illuminates the Earth facing side of the Moon
d
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Young's Modulus: An aluminum wire and a steel wire, each of length 2.0 m, are hung from the ceiling. A 5.0-kg mass is suspended from the lower end of each wire. The aluminum wire has a diameter of 2.2 mm. What must be the diameter of the steel wire if it is to stretch the same distance as the aluminum wire, so that the two wires maintain equal lengths after the masses are attached? Young's modulus for aluminum is 0.70 × 1011 Pa and for steel it is 2.0 × 1011 Pa.
Fill in the blank(s) with the appropriate word(s).
A helium balloon rises because of
a. Archimedes' principle. b. Pascal's principle. c. Bernoulli's principle. d. Torricelli's principle. e. none of these principles.
The Hubble Space Telescope objective mirror is not affected by
a. bad seeing. b. chromatic aberration. c. diffraction. d. chromatic aberration and diffraction. e. bad seeing and chromatic aberration.
Far from their source, electromagnetic waves are
A) elliptical waves. B) longitudinal waves. C) plane waves. D) spherical waves. E) circular waves.