Question

Для перемещения тела весом 8000 H на высоту 1 м использовалась наклонная по наклонной плоскости длинной 4 м при движении по наклонной плоскости на тело действовала сила трения 1000H каков кпд ?

Answer 1

Η = $\frac{A poleznaja}{A zatrachennaja}$ * 100 % 

А полезная = F * S 

F - сила ( 1000 Н )
S - путь ( 4 м )

А п = 1000 * 4 = 4000 Дж 

А затраченная = P * h

P - вес ( 8000 Н )
h - высота ( 1 м )

А з = 8000 * 1 = 8000 Дж 

η = $\frac{4000}{8000}$ = 0,5 * 100 = 50 % 

Answer 2

Calculation of Efficiency

To calculate the efficiency (кпд) of the system, we need to determine the work done and the input energy.

The work done by the system is equal to the force applied multiplied by the distance traveled. In this case, the force applied is the force of friction (сила трения) and the distance traveled is the length of the inclined plane (длина наклонной плоскости).

The input energy is equal to the product of the weight of the body (вес тела) and the height it is lifted (высота).

Let's calculate the efficiency using the given values:

- Weight of the body (W) = 8000 H - Height lifted (h) = 1 m - Length of the inclined plane (L) = 4 m - Force of friction (F) = 1000 H

The work done by the system is given by the formula:

Work = Force x Distance

In this case, the force is the force of friction and the distance is the length of the inclined plane:

Work = F x L

The input energy is given by the formula:

Input Energy = Weight x Height

Substituting the given values:

Input Energy = W x h

Finally, the efficiency is given by the formula:

Efficiency = (Work / Input Energy) x 100%

Let's calculate the efficiency using the given values:

Work = F x L = 1000 H x 4 m = 4000 Hm

Input Energy = W x h = 8000 H x 1 m = 8000 Hm

Efficiency = (Work / Input Energy) x 100% = (4000 Hm / 8000 Hm) x 100% = 50%

Therefore, the efficiency of the system is 50%.

Please note that the provided sources do not contain specific information related to the calculation of efficiency for this particular scenario. The calculation is based on the general principles of work, energy, and efficiency.