Question

Срочно.При помощи подвижного блока равномерно поднимают груз прилагая силу 100 Н . Определите силу трения и КПД установки, если вес блока 20Н ,а вес груза 165Н

Answer 1

Http://5terka.com/node/1719

Answer 2

Calculation of Frictional Force and Efficiency of the System

To calculate the frictional force and the efficiency of the system, we can use the following formulas:

1. Frictional Force (Ff): - The frictional force can be calculated using the formula: *Ff = μ * N*, where *μ* is the coefficient of friction and *N* is the normal force.

2. Efficiency (η): - The efficiency of the system can be calculated using the formula: *η = (useful work output / total work input) * 100%*.

Given: - Force applied (F) = 100 N - Weight of the block (W_block) = 20 N - Weight of the load (W_load) = 165 N

Calculation of Frictional Force

The first step is to calculate the normal force (N) acting on the block. The normal force can be calculated using the formula: *N = W_block + W_load*.

Normal Force (N): - N = 20 N + 165 N - N = 185 N

Now, we can calculate the frictional force using the coefficient of friction. However, the coefficient of friction is not provided, so we cannot calculate the exact value of the frictional force without this information.

Calculation of Efficiency

To calculate the efficiency of the system, we need to determine the useful work output and the total work input. Since the specific work output and input are not provided, we cannot calculate the exact efficiency without this information.

Without the coefficient of friction and specific work output/input, it's not possible to provide the exact values for the frictional force and the efficiency of the system. If you have the coefficient of friction and additional details, please provide them for a more accurate calculation.