Question

При подъеме ящика с гвоздями на высоту 4 м, выполнена работа в 1664 Дж. Вычисли массу гвоздей. если известно, что масса ящика равна 5 кг. Принять, что (g 10- Ответ (округли до целых): масса гвоздей равна

Answer 1

Ответ:

Объяснение:

Пусть суммарная масса ящика с гвоздями равна m.

Тогда:

A = m·g·h

m = A / (g·h) = 1664 / (10·4) ≈ 42 кг

Масса гвоздей:

mг = 42 - 5 = 37 кг

Answer 2

Calculation of the Mass of Nails

To calculate the mass of the nails, we can use the concept of work done. The work done in lifting the box of nails to a height of 4 m is given as 1664 J. The mass of the box is known to be 5 kg. We need to find the mass of the nails.

The work done in lifting an object is given by the formula:

Work = Force x Distance

In this case, the force is equal to the weight of the box and nails, which can be calculated using the formula:

Force = Mass x Acceleration due to gravity

The acceleration due to gravity is approximately 10 m/s^2.

Let's calculate the force exerted on the box:

Force = Mass x Acceleration due to gravity

Force = 5 kg x 10 m/s^2

Force = 50 N

Now, we can calculate the mass of the nails using the work done formula:

Work = Force x Distance

1664 J = 50 N x 4 m

1664 J = 200 Nm

To find the mass of the nails, we can rearrange the formula:

Mass = Work / (Acceleration due to gravity x Distance)

Mass = 200 Nm / (10 m/s^2 x 4 m)

Mass = 5 kg

Therefore, the mass of the nails is 5 kg.

Please note that the answer has been rounded to the nearest whole number, as requested.