Is earth an inertial frame of reference? justify your answer
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Earth is not an inertial reference frame because the Earth rotates and is accelerated with respect to the Sun.

a). in this case, dh> 0 and sd> 0. if t becomes larger, the term "-tds" will become more negative. at some point, it is possible that -dts will be more negative than the dh is positive, and the reaction will become spontaneous. this is probably the correct answer, but you should look at all of the other possibilities and make sure of that.