tác dụng 1 lực Fx=-(3x^2+1) để hãm vật khối lượng 2kg đang chuyển động thẳng theo trục ox tuwfd vị trí x=2 m cho đến khi dừng lại tại vị trí x=4 m . tốc đọ của vật tại vị trí x=2 m bằng .

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Answerthe energy required is 1.60 × 10⁻¹⁸ j, to three significant figures.explanationwe define electric potential as the ratio electric potential energy to the charge,    then the following gives us the potential difference,      the formula  may be on your formula sheet.the change in electric potential energy would be the energy that would needed to move it from point a to point b. solving for that, we get    using q = 8.00  × 10⁻¹⁹ c and  δv = 2.00 v, we get    the energy required is 1.60 × 10⁻¹⁸ j, to three significant figures.

Because there is no air in the jar, the vibrations can not travel through the air and create sound.  (that's why there is no sound in space, there is no air)