Question

1.Человек равномерно толкает вагонетку массой 700 кг по горизонтальному участку пути длиной 200 м. Какую работу совершает человек, если сила трения составляет 0,06 силы тяжести вагонетки? формула A=fs или A=mgh

Answer 1

Ты прав формула должна быть:
A=FS

Ответ:84 кДж

 

Answer 2

Calculating the Work Done by the Person Pushing the Cart

To calculate the work done by the person pushing the cart, we can use the formula W = Fd, where W is the work done, F is the force applied, and d is the distance over which the force is applied.

Given: - Mass of the cart, m = 700 kg - Length of the path, d = 200 m - Coefficient of friction, μ = 0.06 - Force of friction, Ff = μmg (where m is the mass of the cart and g is the acceleration due to gravity)

First, we can calculate the force of friction using the formula Ff = μmg. - m = 700 kg - g = 9.81 m/s^2 (acceleration due to gravity)

Using the formula Ff = μmg: - Ff = 0.06 * 700 * 9.81

We can then calculate the work done using the formula W = Fd.

Calculating the Force of Friction

Using the given mass of the cart and the acceleration due to gravity, we can calculate the force of friction.

The force of friction, Ff, can be calculated using the formula Ff = μmg. - m = 700 kg - g = 9.81 m/s^2

Calculating Ff: - Ff = 0.06 * 700 * 9.81

The force of friction is Ff = 411.18 N.

Calculating the Work Done

Now, we can calculate the work done using the formula W = Fd.

The work done, W, can be calculated using the formula W = Fd. - F = force of friction - d = distance

Substituting the values: - F = 411.18 N - d = 200 m

Calculating W: - W = 411.18 * 200

The work done by the person pushing the cart is 82,236 J (Joules).