Question

Сила,действующая на пути 0,8км в направлении движения,совершила работу 200кДж.Определите модуль силы.

Answer 1

А = F*S
F = A/S=200 000/800=250Н

Answer 2

Calculation of Work Done

To determine the magnitude of the force, we need to use the formula for work done:

Work = Force x Distance x cos(θ)

In this case, the work done is given as 200 kJ (kilojoules) and the distance is 0.8 km. The angle θ is not provided, but since the force is acting in the direction of motion, the angle between the force and the displacement is 0 degrees. Therefore, cos(θ) = 1.

Plugging in the values, we have:

200 kJ = Force x 0.8 km x 1

Conversion of Units

Before we proceed with the calculation, let's convert the distance from kilometers to meters, as the SI unit for distance is meters.

1 km = 1000 m

So, 0.8 km = 0.8 x 1000 m = 800 m.

Now, we can continue with the calculation.

Calculation of Force

Substituting the values into the equation:

200 kJ = Force x 800 m

To find the force, we need to rearrange the equation:

Force = Work / Distance

Plugging in the values:

Force = 200 kJ / 800 m

Calculation Result

Now, let's calculate the magnitude of the force:

Force = 200,000 J / 800 m

Force = 250 N (Newtons)

Therefore, the magnitude of the force is 250 N.

Please note that the angle θ was assumed to be 0 degrees since the force is acting in the direction of motion. If the angle is different, the calculation would involve the cosine of that angle.