Question

Спортсмен поднял штангу массой 75 кг на высоту 2м. На сколько изменилась потенциальная энергия штанги

Answer 1

Calculating Change in Potential Energy of the Barbell

To calculate the change in potential energy of the barbell when it is lifted to a height of 2m, we can use the formula for potential energy:

Potential Energy (PE) = mass (m) * acceleration due to gravity (g) * height (h)

Given: - Mass (m) = 75 kg - Height (h) = 2m - Acceleration due to gravity (g) = 9.81 m/s^2 (standard value)

We can calculate the change in potential energy using the provided values.

Calculation

Using the formula for potential energy, the change in potential energy can be calculated as follows:

Change in Potential Energy = PE_final - PE_initial

Where: - PE_final is the potential energy at the final height - PE_initial is the potential energy at the initial height (ground level)

Let's calculate the change in potential energy using the given values.

Solution

The change in potential energy can be calculated as follows:

PE_final = m * g * h PE_final = 75 kg * 9.81 m/s^2 * 2m PE_final = 1471.5 J

Since the initial potential energy at ground level is zero, the change in potential energy is equal to the potential energy at the final height:

Change in Potential Energy = PE_final - PE_initial Change in Potential Energy = 1471.5 J - 0 J Change in Potential Energy = 1471.5 J

Therefore, the change in potential energy of the barbell when lifted to a height of 2m is 1471.5 joules.

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