Which of these would be the best definition of energy?
a) the ability to do work
b) the development of a future source of fuel
c) the feeling one gets from drinking caffeine
d) the feeling one feels after riding a roller coaster

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.

In the first law of thermodynamics, triangle e=q-w, what does q stand for

How will the system respond to a temperature increase?