Question

для растяжения пружины на 2 см потребовалось совершить работу 1.2 дж .Какую работу нужно совершить,чтобы растянуть пружину еще на 2 см?А.1.2 дж.Б. 2.4 дж.в.3.6 дж.Г. 4.8 дж.

Answer 1

1,2дж/2см=0,6см/дж

2см+2см=4см

4см*0,6см/дж=2,4дж

ответ:Б

Answer 2

2*1.2=2.4дж

ответ=Б=2.4ДЖ

Answer 3

Calculation of Work Done to Stretch the Spring

To calculate the work done to stretch the spring by an additional 2 cm, we can use the formula for the work done on a spring:

Work = (1/2) * k * x^2

Where: - Work is the work done on the spring - k is the spring constant - x is the displacement of the spring

Given that the work done to stretch the spring by 2 cm is 1.2 J, we can substitute the values into the formula and solve for the spring constant:

1.2 J = (1/2) * k * (0.02 m)^2

Simplifying the equation:

1.2 J = (1/2) * k * 0.0004 m^2

Now, we can solve for the spring constant k:

k = (1.2 J) / ((1/2) * 0.0004 m^2)

k = 1.2 J / 0.0002 m^2

k = 6000 N/m

Calculation of Work Required to Stretch the Spring by an Additional 2 cm

To calculate the work required to stretch the spring by an additional 2 cm, we can use the same formula:

Work = (1/2) * k * x^2

Where: - Work is the work required to stretch the spring - k is the spring constant (which we calculated as 6000 N/m) - x is the displacement of the spring (which is 0.02 m for an additional 2 cm)

Substituting the values into the formula:

Work = (1/2) * 6000 N/m * (0.02 m)^2

Simplifying the equation:

Work = (1/2) * 6000 N/m * 0.0004 m^2

Work = 1.2 J

Therefore, the work required to stretch the spring by an additional 2 cm is 1.2 J.

So, the correct answer is A. 1.2 J.