Question

Груз массой 25 кг поднимают с помощью блока прикладывая силу 270 н Определить КПД блока

Answer 1

Сила тяжести Fтяж.=mg=25х10=250           КПД-250/270х100=92%

Answer 2

Calculating the Efficiency of the Block

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

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

Where: - Useful work output is the work done in lifting the load. - Total work input is the work done by the force applied to lift the load.

Calculating Useful Work Output

The useful work output is the work done in lifting the load, which can be calculated using the formula:

Useful work output = Force applied * Distance lifted

Given: - Force applied (F) = 270 N - Distance lifted (h) = Not provided

Unfortunately, the distance lifted (h) is not provided in the question or the search results. Without this information, it's not possible to calculate the useful work output.

Calculating Total Work Input

The total work input is the work done by the force applied to lift the load, which can be calculated using the formula:

Total work input = Force applied * Distance moved by the force

Similar to the useful work output, the distance moved by the force (or the distance the force is applied over) is not provided in the question or the search results. Without this information, it's not possible to calculate the total work input.

Conclusion

Unfortunately, without the distance lifted and the distance moved by the force, it's not possible to calculate the efficiency (КПД) of the block. If you have the additional information about the distances, please provide it, and I'd be happy to help you calculate the efficiency.