# The efficiency of an inclined plane is 70%. What is its length if a force of 60N is required to lift

December 27, 2020 | education

| **The efficiency of an inclined plane is 70%. What is its length if a force of 60N is required to lift a load weighing 28 kg? The height of the inclined plane is 60 cm.**

Step one.

Let us determine what useful work will be done if, according to the condition of this task, the mass of the load lifted to a height of 60 centimeters is 28 kilograms:

60 cm is 0.6 kg;

Apol = m * g * h;

28 * 10 * 0.6 = 168.

Step two.

Now we need to determine what work was actually expended to lift this load:

Azatr = Apol: efficiency * 100%;

168: 70 * 100 = 240.

Step three.

Find out what the length will be:

Azatr = F * l;

240: 60 = 4.

Answer: 4 meters.

One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.