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Exercício de A variação da temperatura na escala Fahrenheit
Sua Pergunta:
Um bloco de cobre (c = 0,094 cal/gºC) de 1,2kg é colocado num forno até atingir o equilíbrio térmico. Nessa situação, o bloco recebeu 12 972 cal. A variação da temperatura sofrida, na escala Fahrenheit, é de:
a) 60ºF
b) 115ºF
c) 207ºF
d) 239ºF
e) 347ºF
Resposta: C
Q=12972cal
C=0,094cal/g/°c
C=Q/taxa de variação de temperatura
Q=mxcxt
taxa de variação de temperatura=12972/0.094X1200
taxa de variação de temperatura=12972/112,8=115°c
115°c/5=taxa de variação °F/9
taxa de variação °F=207
e por que a temperatura: 77+12 Cº é = a 77
Q=12972calC=0,094cal/g/°cC=Q/taxa de variação de temperaturaQ=mxcxttaxa de variação de temperatura=12972/0.094X1200taxa de variação de temperatura=12972/112,8=115°c115°c/5=taxa de variação °F-32/9taxa de variação °F=239
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