Which is least expensive-for the same energy delivered?
A. coal
B. gasoline
C. natural gas
D. AAA batteries
Answer: A. coal
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A ball that gains speed as it rolls down a hill experiences a
A) net torque. B) net force. C) both of these D) neither of these
State the condition for an object to be in translational equilibrium
What will be an ideal response?
At which lunar phase(s) are tides most pronounced (e.g., the highest high tides)?
A) first quarter B) new Moon C) full Moon D) both new and full Moons E) both first and third quarters
Suppose there are a million habitable planets in our galaxy, that one in ten are habitable, that one in a thousand planets with life had at some point had an intelligent civilization, and that one in a hundred civilizations that has ever existed is
in existence now. Given this, how many civilizations are in existence now? A) 10 B) 1 C) 1000 D) 100