Question

Брусок равномерно движется по поверхности стола со скоростью 20м/с под действием горизонтально направленной силы F=10H .Какую работу выполняет сила F за 15 с.?

Answer 1

A=Nt, N=Fv=10Н х 20м/с=200Вт, A=200Вт х 15с=3000Дж=3кДж.
Ответ: 3кДж.

Answer 2

Calculation of Work Done by the Force

To calculate the work done by a force, we can use the formula:

Work = Force × Distance

In this case, the force acting on the block is given as F = 10 N and the time interval is 15 s. However, we need to determine the distance traveled by the block in order to calculate the work done.

Determining the Distance Traveled

To determine the distance traveled by the block, we need to know the initial velocity of the block. Unfortunately, the initial velocity is not provided in the question. Therefore, we cannot accurately calculate the distance traveled by the block.

However, if we assume that the initial velocity of the block is zero, we can use the formula for distance traveled with constant acceleration:

Distance = (Initial Velocity × Time) + (0.5 × Acceleration × Time^2)

In this case, the acceleration can be calculated using Newton's second law:

Acceleration = Force / Mass

Since the mass of the block is not provided, we cannot accurately calculate