Gold alloys are

much harder than pure gold
do not last as long as pure gold
much more valuable than pure gold
much softer than pure gold

in this image, you can see solar radiation going through ocean water.

no image, but probably absorption

one person pulls 90n one way and the other has 100n pulling the other way.

so the net force = 90 - 100 = -10n,

or the ans can be 10n if the picture shows -90n and 100n instead.

i do.

explanation:

i want to explore the wonders of the universe and find out if there really is life out there. i think the universe is beautiful.