The distance to the andromeda galaxy is estimated at about 2 ´ 106 light years. a light year is the distance traveled by light in one year; if the speed of light is 3 ´ 108 m/s, about how far is it from our galaxy to andromeda? (1 year = 3.15 ´ 107 s)

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?

Curious carl calculated the density of a cube to be 4.50 g/cm3. what is the density of the cube in g/l?

Write down two additional questions about earth's magnetic field that will make your presentation more informative.