A 0.70kW vacuum cleaner is used for 20 minutes. How much energy does it use? Give your answer in
2 answers:
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Answer:
102 m upwards.
Explanation:
Just from a qualitative analysis we can tell the mass it needs to go upwards. How much we determine with the fact that the increase will be - in absolute value - equal to the work gravity does on it to go down that same distance.
Fixed that work being 1 kJ, we get