Question

Поднимая груз массой 40кг с помощью подвижного блока, на трос действуют силой 250 Н. Каков коэффициент полезного действия блока?

Answer 1

В два раза меньше исходного, за щет подвижного блока, то есть 6.25H

Answer 2

Calculating the Mechanical Advantage and Efficiency of the Block

To calculate the mechanical advantage (MA) and efficiency of the block, we can use the following formulas:

Mechanical Advantage (MA): MA = Load Force / Effort Force

Efficiency: Efficiency = (MA without considering friction) / (MA considering friction) * 100%

Given: - Load Force (Fload) = 250 N - Effort Force (Feffort) = ? - Load Mass (m) = 40 kg - Effort Distance (d1) = ? - Load Distance (d2) = ?

We need to find the effort force and the distances to calculate the mechanical advantage and efficiency.

Finding Effort Force and Distances

To find the effort force, we can use the formula: Effort Force = Load Force / Mechanical Advantage

To find the distances, we can use the formula: Effort Distance = Load Distance / Mechanical Advantage

Calculating Mechanical Advantage and Efficiency

Let's calculate the mechanical advantage and efficiency using the given load force, load mass, and effort force.

Mechanical Advantage: MA = Load Force / Effort Force MA = 250 N / Effort Force

Efficiency: Efficiency = (MA without considering friction) / (MA considering friction) * 100%

Now, let's calculate the effort force and distances to find the mechanical advantage and efficiency.

Conclusion

After calculating the effort force and distances, we can determine the mechanical advantage and efficiency of the block.