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1. Suppose you are served coffee at a restaurant and want it to be hot
when you are ready to drink it a few minutes later. You should add the
room-temperature cream to it...
a. right away
b. when you are ready to drink it
c. either - the effect will be the same
3. These two balloons are the same size and are filled with the same
amount of helium. Which will rise faster on a sunny day?
a. black balloon
b. white balloon
c. both at the same rate