في عمليّة تحليل كهربائيّ للماء (إلكتروليزا) تمّ تحليل 18 غرام ماء. كتلة الهيدروجين التي تمّ الحصول عليها هي 2 غرام. على كم غرام أوكسجين حصلنا؟ علِّلوا إجابتكم.

Answerthe force between the charges will be  f/9 (one-ninth of force f)explanationcoulomb's law relates the magnitudes  two point charges q₁ and q₂, the distance, r, between the charges, and the electrostatic force, f, between the two charges:     k represents coulomb's constant, k = 8.99×10⁹ n·m²/c².note that if we have r = 3r, then   

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Dformation of a precipitate

Sounds propagates through some kind of medium. usually it's air, but it goes just as well through solid objects like walls, windows etc. a soundwave will compress the (air)molecules in front of it, and if this increased density wave hits your ears, you register it as sound. solid objects like walls are a lot denser than air, this means that they will damp a wave, but also carry it easier.