Question

. Человек поднял за 30 с ведро воды массой 7,5 кг из колодца глубиной 7 м аботу совершил человек? Какую мощность он при этом развивал? Считайте, что ведро двигалось равномерно. ПОМОГИТЕ УМОЛЯЮЮЮЮЮЮЮЮЮЮ.​

Answer 1

Ответ:

Объяснение:

Дано:

t = 30 с

m = 7,5 кг

h = 7 м

_________

A - ?

N - ?

1)

Работа, совершенная человеком:

A = m·g·h

A = 7,5·10·7 = 525 Дж

2)

Развиваемая мощность:

N = A / t

N = 525 / 30 = 17,5 Вт

Answer 2

Calculation of Work and Power

To calculate the work done and power developed by a person who lifts a bucket of water from a well, we need to use the formulas for work and power.

Work (W) is defined as the product of force and displacement in the direction of the force. In this case, the force is the weight of the bucket of water and the displacement is the height the bucket is lifted.

Power (P) is the rate at which work is done, or the amount of work done per unit time.

Let's calculate the work and power using the given information:

Given: - Mass of the bucket of water (m) = 7.5 kg - Depth of the well (h) = 7 m - Time taken to lift the bucket (t) = 30 s

Calculation of Work:

The work done is equal to the product of the force and the displacement. In this case, the force is the weight of the bucket of water, which can be calculated using the formula:

Force (F) = mass (m) x acceleration due to gravity (g)

where the acceleration due to gravity (g) is approximately 9.8 m/s^2.

The displacement is the height the bucket is lifted, which is equal to the depth of the well.

Using these values, we can calculate the work done:

Work (W) = Force (F) x Displacement (h)

Work (W) = m x g x h

Substituting the given values:

Work (W) = 7.5 kg x 9.8 m/s^2 x 7 m

Now, let's calculate the work:

Work (W) = 514.5 Joules

Therefore, the work done by the person is 514.5 Joules.

Calculation of Power:

Power is the rate at which work is done, or the amount of work done per unit time. It can be calculated using the formula:

Power (P) = Work (W) / Time (t)

Substituting the given values:

Power (P) = 514.5 Joules / 30 s

Now, let's calculate the power:

Power (P) = 17.15 Watts

Therefore, the power developed by the person is 17.15 Watts.

To summarize: - The work done by the person is 514.5 Joules. - The power developed by the person is 17.15 Watts.

Please note that these calculations assume ideal conditions, such as no energy losses due to friction or other factors.