Water can dissolve salt<span> because the positive part of water molecules attracts the negative </span>chloride<span> ions and the negative part of water molecules attracts the positive </span>sodium<span> ions. The amount of a substance that </span>can dissolve<span> in a liquid (at a particular temperature) is called the </span>solubility<span> of the substance.</span>
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Rectilinear propagation describes the tendency of electromagnetic waves to travel in a straight line. Light does not deviate when travelling through a homogeneous medium, which has the same refractive index throughout; otherwise, light suffers refraction.
The answer is false. The speed of the astronaut cancels out the force of gravity, causing a 'stationary freefall'. While under these effects, it is not required for an astronaut to 'strengthen' his body.
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sorry I dont now the answer bro i am so sorry xd ;'(
2. random motion in vertical direction
