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01 Feb 2021, 13:39
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C
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15%
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78% (01:09) correct
22%
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wrong
based on 110
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What is the number of 360-degree rotations that a bicycle wheel made while rolling 150 meters in a straight line without slipping?
(1) It took 3 minutes for the bicycle wheel to travel the entire distance.
(2) The wheel made twenty 360-degree rotations per minute.
(1) It took 3 minutes for the bicycle wheel to travel the entire distance.
(2) The wheel made twenty 360-degree rotations per minute.
18 Feb 2021, 10:45
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sthahvi
We are asked for the number of 360 rotations of the wheel:
Statement A: This gives us the time, but we don't know anything about the size of the wheel => Insuff.
Statement B: We know how many times the wheel spinned per minute, but we don't know anything about the time it took
Combined: We know 3 min. for the whole trip and 20 spins per minute so 60 for the entire trip Suff. => C
