Question

Довгий (I) тонкий стержень масою m,що лежав на горизонтальнiй поверхнi,пiдняли у вертикальне положення.На скiльки змiнилась потенцiальна енергiя стержня

Answer 1

Если длина стержня L, то потенциальная энергия определяется высотой поднятия центра тяжести стержня (h=L/2)
Ep=m*g*L/2

Answer 2

Calculation of Potential Energy Change

To calculate the change in potential energy of the thin rod when it is lifted from a horizontal position to a vertical position, we can use the formula for potential energy:

Change in potential energy = mgh

Where: - m = mass of the rod - g = acceleration due to gravity - h = change in height

Given that the mass of the rod is denoted by m and it is lifted from a horizontal position to a vertical position, the change in height, h, is the length of the rod.

Calculation

The change in potential energy can be calculated using the formula mentioned above.

Change in potential energy = mgh

Since the rod is lifted from a horizontal position to a vertical position, the change in height, h, is the length of the rod.

Conclusion

The change in potential energy of the thin rod when lifted from a horizontal position to a vertical position can be calculated using the formula Change in potential energy = mgh, where m is the mass of the rod, g is the acceleration due to gravity, and h is the change in height, which in this case is the length of the rod.