Question

Ведро с песком весом 200н поднимают при помощи неподвижного блока на высоту 10м. действуя на верёвку с силой 250н. вычисли кпд неподвижного блока.

Answer 1

250-200=50
50/10=5
Ответ5

Answer 2

Calculation of Efficiency of the Fixed Block

To calculate the efficiency of the fixed block, we need to first understand the concept of efficiency. Efficiency is a measure of how effectively a machine or system converts input energy into useful output energy. In this case, the input energy is the work done on the rope, and the output energy is the work done in lifting the bucket of sand.

The formula for efficiency is:

Efficiency = (Output Work / Input Work) * 100%

In this scenario, the input work is the force applied to the rope multiplied by the distance over which the force is applied. The output work is the weight of the bucket of sand multiplied by the height it is lifted.

Given: - Weight of the bucket of sand = 200 N - Height lifted = 10 m - Force applied to the rope = 250 N

Let's calculate the efficiency:

Input Work = Force * Distance The distance over which the force is applied is the same as the height lifted, which is 10 m. Therefore, the input work is:

Input Work = 250 N * 10 m = 2500 Nm

Output Work = Weight * Height The weight of the bucket of sand is 200 N, and the height lifted is 10 m. Therefore, the output work is:

Output Work = 200 N * 10 m = 2000 Nm

Now we can calculate the efficiency:

Efficiency = (Output Work / Input Work) * 100% Efficiency = (2000 Nm / 2500 Nm) * 100% Efficiency = 0.8 * 100% Efficiency = 80%

Therefore, the efficiency of the fixed block in this scenario is 80%.