Traditional Culture Encyclopedia - Traditional virtues - This year, the Hubei Provincial Party Committee and Provincial Government made the decision to build "China Agricultural Valley" and develop Jingmen. A large-scale enterprise decided to take advantage

This year, the Hubei Provincial Party Committee and Provincial Government made the decision to build "China Agricultural Valley" and develop Jingmen. A large-scale enterprise decided to take advantage

This year, the Hubei Provincial Party Committee and Provincial Government made the decision to build "China Agricultural Valley" and develop Jingmen. A large-scale enterprise decided to take advantage of this good opportunity to invest in Jingmen, in into the

Solution: (1) Save energy ?

(2) The time taken by the traction machine to pull the material from the bottom of the slope to the top: t = s/υ = 15m/1m/s = 15s?

(3) The height of the slope: h = sina30° × s = 1/2 × 15m = 7.5m

The useful work done by pulling the material up to the top of the slope: W has = G h = ×7.5m=1 × 10 5 N × 7.5 m = 7.5 × 10 5 J

Total work done by the traction machine on the material: W = Pt = 6 × 10 4 W × 15s = 9 × 10 5 J

Mechanical efficiency: η = W have / W = 7.5 × 10 5 J / 9 × 10 5 J = 83.3 %

(4)

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