Why does fossil fuel use in the united states make the u. s. vulnerable to the political wishes of foreign countries?
a. the us is a net exporter of fossil fuels.
b. fossil fuels lead to global climate change.
c. the us imports much of its petroleum from foreign countries which set the prices.
d. all of the above.

To find the work done, the force exerted and distance moved are multiplied. a couch is moved twice before you are happy with its placement. the same force was used to move the couch both times. if more work is done the first time it is moved, what do you know about the distance it was moved? a) when more work was done, the couch was moved the same distance. b) when more work was done, the couch was moved less. c) when more work was done, the couch was moved further. d) when more work was done, the couch wasn't moved at all.