PLEASE HELP THIS IS THE LAST DAY AND IM FAILING In this lab, what did the pennies represent? (im sorry if the words are small on the paper it makes me crop it so i had to put my camera farther away)

How does the principle of electromagnetism explain the interaction between earth’s magnetic field and the solar wind?

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.

How many grams of magnesium metal will react completely with 8.3 liters of 5.5m hcl? show all work