Your feet feel warmer on a rug than on a tile floor because the rug
a. is usually warmer than the tile
b. is a better insulator than tile
c. has more internal energy than tile for the same mass
d. all of these
Question 2
A river has a steady speed of 0.30 m/s. A student swims downstream a distance of 1.2 km and returns to the starting point. If the student swims with respect to the water at a constant speed and the downstream portion of the swim requires 20 minutes, how much time is required for the entire swim?
a. 50 minutes
b. 80 minutes
c. 90 minutes
d. 70 minutes
e. 60 minutes
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