The natural source of acidity in rain water is ___. carbonic acid
sulfuric acid
nitric acid
all of the above

The place you get your hair cut has two nearly parallel mirrors 6.00 m apart. as you sit in the chair, your head is 2.00 m from the nearer mirror. looking toward this mirror, you first see your face and then, farther away, the back of your head. (the mirrors need to be slightly nonparallel for you to be able to see the back of your head, but you can treat them as parallel in this problem.) how far away does the back of your head appear to be?

If y gets smaller as x gets bigger and y have an relationship?

Consider an air-filled charged capacitor. how can its capacitance be increased?