In a power plant called answers which of these first

Light from the sun reaches the earth in 8.3 minutes. the velocity is 3.00 x 10^8 m/s. how far is earth from the sun? i know how to get to d = (3 x 10^8 m/s)(498 sec). i just don't know how to get from there to the answer being 1.5 x 10^11 m.

J. j. thomson’s experiment disproved the theory that an atom

What’s #16 asking me and how do i solve it?