A 550 Newton force is used to pull a 56 kg crate across the floor in 38 seconds. What is the power used in moving the crate?

Asun-sized star will spend most of its lifetime as a: white dwarf red giant protostar main-sequence star

Which changes of state do the labels represent? a: b: c:

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.