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Evaluate the efficiency of two identical-looking lifts. Lift A can raise a
5-newton weight 4 meters in 3 seconds. Lift B can raise a 10-newton
weight 3 meters in 3 seconds. The input work for each lift is 40 joules.
(1 joule = 1 newton-meter.) Fill in the missing numbers below.
Weight (newtons)
Distance (meters)
Time (seconds)
Input work (Win)
Output work (Wout)
Efficiency (%) =
Wout Win X 100
What do you know?
Lift A
4
3
40 J
Lift B
3
40 J

Sagot :

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