To load heavy equipment aboard a cargo boat, the geologist used plank flooring as an inclined plane.

| August 8, 2021 | education

To load heavy equipment aboard a cargo boat, the geologist used plank flooring as an inclined plane. When loading, useful work of 900 J was performed, and the total work was 2 kJ. Determine the efficiency of the inclined plane. What work has been done to overcome the frictional force? What is the friction force if the board is 4 meters long?

Apolezna = 900 J
Apolnaya = 2kJ = 2000 J
l = 4 m
μ-?
Atrenia-?
The efficiency is determined by the formula μ = (Apolezna / Apolnaya) * 100%. Let’s find the efficiency μ = (900 J / 2000 J) * 100% = 45%. Since the total work is 2000 J, and the useful one is 900 J, it means that Atrenia = Apolnaya-Apolisna went to overcome the friction force. Atrenia = 2000J-900J = 1100J. And the same work of the friction force of Atrenia is determined by the formula Atrenia = Ftr * l. Ftr = Atrenia / l = 1100J / 4 = 275 N.



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