Question

определите работу, совершённую при равномерном перемещении бруска на 45 м, если сила трения равна 740 Н? Чему равна мощность развиваемая силой, если работа была выполнена за 2 минуты.​

Answer 1

Ответ:

277,5 Вт.

Объяснение:

ДАНО:

F(сила трения) = 740 Н

S(путь) = 45 м.

t(время) = 2 мин. = 120 сек.

НАЙТИ:

N(мощность) - ?

РЕШЕНИЕ:

N = A / t

A = F × S = 45 × 740 = 33 300 Дж

N = 33 300 / 120 = 277,5 Вт

Ответ : 277,5 Вт.

Answer 2

Determining the Work Done

To determine the work done during the uniform displacement of the block over a distance of 45 m with a friction force of 740 N, we can use the formula for work done, which is given by:

Work = Force × Distance × Cos(θ)

Where: - Force = 740 N (friction force) - Distance = 45 m - θ = Angle between the force and the direction of displacement (assuming the force and displacement are in the same direction, so θ = 0°)

Using this formula, we can calculate the work done.

The work done can be calculated as follows: Work = 740 N × 45 m × Cos(0°)

The value of Cos(0°) is 1, so the work done can be calculated as: Work = 740 N × 45 m × 1

Let's calculate the work done.

Calculating the Work Done

Work = 740 N × 45 m × 1 Work = 33300 J

The work done during the uniform displacement of the block over a distance of 45 m with a friction force of 740 N is 33300 Joules.

Determining the Power Developed

To determine the power developed by the force, given that the work was performed in 2 minutes, we can use the formula for power, which is given by:

Power = Work / Time

Where: - Work = 33300 J (calculated earlier) - Time = 2 minutes = 120 seconds

Using this formula, we can calculate the power developed.

The power developed can be calculated as follows: Power = 33300 J / 120 s

Let's calculate the power developed.

Calculating the Power Developed

Power = 33300 J / 120 s Power ≈ 277.5 W

The power developed by the force, given that the work was performed in 2 minutes, is approximately 277.5 Watts.

Therefore, the work done during the uniform displacement of the block over a distance of 45 m with a friction force of 740 N is 33300 Joules, and the power developed by the force is approximately 277.5 Watts.