Question

Груз массой 320 кг подняли с помощью рычага на 25 см, прикладывая к длинному концу рычага силу 800Н. Каков КПД рычага, если точка приложения этой силы переместилась на 1 м 25 см объяснить подробно,с формулами!!!

Answer 1

Ответ:

немного грязновато...........

Answer 2

Efficiency of a Lever

To calculate the efficiency of a lever, we need to determine the work input and work output of the lever system. The efficiency of a lever is defined as the ratio of the work output to the work input, expressed as a percentage.

Work Input and Work Output

The work input of the lever system is the product of the force applied to the lever and the distance over which the force is applied. In this case, the force applied to the lever is 800 N, and the distance over which the force is applied is 25 cm.

The work output of the lever system is the product of the weight lifted and the distance over which it is lifted. The weight lifted is equal to the mass of the load multiplied by the acceleration due to gravity. In this case, the mass of the load is 320 kg, and the distance over which it is lifted is 1 m 25 cm.

Calculation

Let's calculate the work input and work output of the lever system.

Work Input: Force applied to the lever = 800 N Distance over which the force is applied = 25 cm = 0.25 m

Work input = Force applied * Distance Work input = 800 N * 0.25 m Work input = 200 J

Work Output: Mass of the load = 320 kg Acceleration due to gravity = 9.8 m/s^2 Distance over which the load is lifted = 1 m 25 cm = 1.25 m

Weight lifted = Mass * Acceleration due to gravity Weight lifted = 320 kg * 9.8 m/s^2 Weight lifted = 3136 N

Work output = Weight lifted * Distance Work output = 3136 N * 1.25 m Work output = 3920 J

Efficiency Calculation

Now that we have the work input and work output, we can calculate the efficiency of the lever system.

Efficiency = (Work output / Work input) * 100% Efficiency = (3920 J / 200 J) * 100% Efficiency = 19.6%

Therefore, the efficiency of the lever system is 19.6%.

Please note that the above calculations assume ideal conditions and do not take into account any losses due to friction or other factors that may affect the efficiency of the lever system.