If the Moon's orbital plane was aligned with the celestial equator we could
a. have eclipses every month.
b. never have eclipses.
c. have eclipses only at solstice.
d. have eclipses only at the equinoxes.
D
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What, according to the chapter, is the essence of the paradox in Schrödinger’s cat paradox?
A. Opening the box (and thus observing the cat) might kill it, contrary to our experience of reality. B. The cat, though it should be described by quantum mechanics, never displays the features of a superposition state, like microscopic systems do. C. The cat being alive or being dead are not mutually exclusive possibilities, contrary to what we think. D. Human consciousness is necessary to collapse the cat’s state to being alive or dead. E. Something else (explain).
A cable is 50.0 m long and has a diameter of 2.50 cm. A force of 10,000 N is applied to the end of the cable. If the maximum stretch allowed in the cable is 2.00 mm, then what is the minimum tensile modulus allowed?
a. 
b. 
c. 
d. 
e. 
Does Earth's gravity pull more strongly on a block of wood or on a block or iron having the same size? Neglecting air resistance, which one falls faster when dropped?
A) Gravity pulls more strongly on the iron, and both fall at the same speed. B) Gravity pulls equally strongly on both, and both fall at the same speed. C) Gravity pulls equally strongly on both, and the iron falls faster. D) Gravity pulls more strongly on the iron, and the iron falls faster. E) None of the above.
The half-life of 3H is 12 years. About how long does it take for 7/8 of a sample of that radionuclide to decay?
a. 3 years b. 24 years c. 4 years d. 36 years