Which of the following stars is the hottest?
A) a blue star
B) an orange star
C) a yellow star
D) a green star
E) a red star
A) a blue star
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If heat is flowing from a table to a block of ice moving across the table, which of the following must be true?
a. The table is rough and there is friction between the table and ice. b. The ice is cooler than the table. c. The ice is changing phase. d. All three are possible, but none is absolutely necessary.
Identical 8.0-?C point charges are positioned on the x axis at x = ±1.0 m and released from rest simultaneously. What is the kinetic energy of either of the charges after it has moved 2.0 m?
a. 84 mJ b. 54 mJ c. 96 mJ d. 63 mJ e. 48 mJ
100 grams of molten lead (600°C) is used to make musket balls. If the lead shot is allowed to cool to room temperature (21°C), what is the change in entropy (in J/K) of the lead? (For the specific heat of molten and solid lead use 1.29 J/g/°C; the latent heat of fusion and the melting point of lead are 2.45 × 10^4 J/kg and 327°C.)
a. ?145 b. ?252 c. ?302 d. ?429 e. ?100
You discover a new star that is 352,800 AU away. What is the distance in light years?
a. 5.6 ly b. 2.3 ly c. 63 ly d. 3.53 ly e. 2.22 x 10^2 ly