Which will leak more neutrons?
A) two separate lumps of uranium.
B) the same two lumps stuck together.
C) both the same
Answer: A
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Two cars start at the same point, but travel in opposite directions on a circular path of radius R, each at speed v. While each car travels a distance less than 
, one quarter circle, the center of mass of the two cars
A. remains at the initial point. B. travels along a diameter of the circle at speed v' v. E. remains at the center of the circle.
What is the change in entropy of the lead when 2.0 kg of molten lead solidifies? [Data: Lv = 207. kcal/kg at 1744.°C; Lf = 5.9 kcal/kg at 328.°C]
What will be an ideal response?
A meteor shower is produced when
a. a large number of sporadic meteors are observed. b. Earth passes through the asteroid belt. c. massive particles are carried outward from the Sun by the solar wind and enter Earth's atmosphere. d. Earth passes through the orbital path of a comet. e. meteors cause condensation in the upper atmosphere that leads to early morning rains.
Angela claims that she wears a cylindrical-shaped hollow gold bracelet because it expands less than a solid one with a change in temperature. Clarissa claims that a cylindrical-shaped solid gold bracelet expands less than a hollow one. Which one, if either, is correct?
a. Angela, because the bracelet expands outward on its outer surface and inward on its inner surface. b. Clarissa, because the bracelet expands outward on its outer surface and inward on its inner surface. c. Angela, because the inner circumference does not change, but the outer circumference expands. d. Clarissa, because the inner circumference does not change, but the outer circumference expands. e. Neither, because both the inner and outer circumferences increase in length.