Which is least expensive-for the same energy delivered?

A. coal
B. gasoline
C. natural gas
D. AAA batteries


Answer: A. coal

Physics & Space Science

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At which lunar phase(s) are tides most pronounced (e.g., the highest high tides)?

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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

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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

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State the condition for an object to be in translational equilibrium

What will be an ideal response?

Physics & Space Science