5) John's grandfather used to gaze at the night sky when he was a boy in 1940. John gazes at this same sky in 2008. The
sky that John sees is
A)
almost the same as the one his grandfather saw.
B)
exactly the same as the one his grandfather saw.
C)
mostly different from the one his grandfather saw.
D)
completely different from the one his grandfather saw.

your answer is rna to the question.

before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.

i think its both a and b