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If the work output of a simple machine is 40 J and the work input is 50 J, the percent efficiency is %.
A. 5/4
B. 10
C. 80
D. 90

What distance does a car travel as its speed changes from 0 to 20 m/s in 17 s at constant acceleration?

Which statement best describes the superposition principle? a.) if two in-phase waves arrive simultaneously at a point, their amplitudes add up b.) if two out-of-phase waves arrive simultaneously at a point, their amplitudes add up c.) if two in-phase waves arrive at a point one after another, their amplitudes add up d.) if two out-of-phase waves arrive at a point one after another, their amplitudes adds up

Identify some abiotic characteristics of the tundra biome.