Question

На коротком плече рычага укреплен груз массой 60 кг. Для подъема груза на высоту 3 см пришлось совершить работу 24 Дж. Определите КПД рычага. Через Дано)

Answer 1

Решение в прикрепленном файле

Answer 2

Given Information:

- Mass of the load: 60 kg - Height lifted: 3 cm - Work done: 24 J

Calculation:

To determine the efficiency (КПД) of the lever, we can use the formula:

Efficiency (КПД) = (Useful work output / Total work input) * 100%

In this case, the useful work output is the work done to lift the load, which is 24 J. The total work input is the work done by the lever, which can be calculated using the formula:

Total work input = Force applied * Distance moved

The force applied can be calculated using the formula:

Force = Mass * Acceleration due to gravity

The distance moved is the height lifted, which is 3 cm. However, we need to convert it to meters by dividing it by 100.

Let's calculate the efficiency of the lever:

1. Calculate the force applied: - Force = Mass * Acceleration due to gravity - Force = 60 kg * 9.8 m/s^2 - Force = 588 N

2. Calculate the total work input: - Total work input = Force applied * Distance moved - Total work input = 588 N * (3 cm / 100) - Total work input = 17.64 J

3. Calculate the efficiency: - Efficiency (КПД) = (Useful work output / Total work input) * 100% - Efficiency (КПД) = (24 J / 17.64 J) * 100% - Efficiency (КПД) ≈ 136.36%

Answer:

The efficiency (КПД) of the lever is approximately 136.36%.