Which description explains the flow of heat?

a. from cold to hot
b. from hot to cold
c. from cool to warm
d. from cold to warm

Heat from the sun reaches earth to a. radiation b. convection c. conduction

Which property of fossils allow scientists to determine the relative rock ages..

Two objects of different mass start from rest, are pulled by the same magnitude net force, and are moved through the same distance. the work done on object 1 is 900 j. after the force has pulled each object, object 1 moves twice as fast as object 2. how much work is done on object 2?