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a)po
p= po +pgh /-pgh
p-pgh=po
g
p= po +pgh /-po
p-po=pgh /:ph
(p-po)/ph= g
b) t2
Q = mc ( t 2 - t1 ) /:mc
Q/mc=t2-t1 /+t1
t2=(Q/mc)+t1
m
Q = mc ( t 2 - t1 ) /:(t2-t1)
Q/(t2-t1)=mc /:c
Q/[c(t2-t1)]=m