Question

Два тела одинаковых масс падают с одной и той же высоты. Первое тело падает в атмосфере Земли, а второе в -вакууме. Какое из нижеприведенных утверждений не справедливо? А) Полная механическая энергия одинакова только в начале движения. B) Кинетические энергии тел в конце пути различны. C) Кинетические энергии тел в конце пути одинаковы. D) Потенциальная энергия в начальный момент времени одинакова. E) Потенциальная энергия в конце пути одинакова.

Answer 1

A)Да (скорость одна и та же)

B)Да (в атмосфере тело совершит работу и потерияет некоторое количество энергии, в отличие от второго случая)

C)Да (он оба в конце концов упадут, v=0, кин.энергия будет равна нулю)

D)Да ( высота одинаковая)

E) Да (опять же, высота у обоих будет равна 0)

Answer 2

Statement Analysis

The question asks which of the following statements is not true when two bodies of equal mass fall from the same height, with one falling in Earth's atmosphere and the other falling in a vacuum. Let's analyze each statement:

A) The total mechanical energy is the same only at the beginning of the motion. B) The kinetic energies of the bodies at the end of the path are different. C) The kinetic energies of the bodies at the end of the path are the same. D) The potential energy at the initial moment is the same. E) The potential energy at the end of the path is the same.

We need to determine which of these statements is not true.

Analysis of Statements

A) The total mechanical energy is the same only at the beginning of the motion.

B) The kinetic energies of the bodies at the end of the path are different.

C) The kinetic energies of the bodies at the end of the path are the same.

D) The potential energy at the initial moment is the same.

E) The potential energy at the end of the path is the same.

Answer

Based on the analysis, the statement that is not true is B) The kinetic energies of the bodies at the end of the path are different. The kinetic energies of the bodies at the end of the path are actually the same.

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