I don't understand how to do this . Can you guys help me​

According to coulomb's law, how would the electrical force between particles change if the product of their electrical charge increased?

At 300 mm hg, a gas has a volume of 380 l, what is the volume at standard pressure

Look at the spectrums of a star moving towards earth and a motionless star. which of these is a correct inference that can be draw from the observation of the two spectrums? (2 points) the spectrum of a motionless star is difficult to be viewed separately using oridinary telescopes. the spectrum of a motionless star is identical to the spectrum of a star which moves towards earth. the spectrum of a star shifts towards the red region when the star moves towards earth. the spectrum of a star shifts towards the blue region when the star moves towards earth.