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2. (benda 1 adalah padat, benda 2 adalah cair, benda 3 adalah gas) (B)
3. x 40 + 32 = 90 + 32 = 122 F (D)
4. B-C --> Q = m.L = 100 gram . 80 kal/gram = 0,1 . 80 = 8
C-D --> Q = m.c.t = 0,1 . 1 . 100 = 10
B-D --> 8 + 10 = 18 kkal (C)
5. A : B = 25 : 50 = 1 : 2 (B)
6. Ek1 : Ek2 = m. 2.v : m. v
= 2 : 1
= 4 : 1 (D)
7. (B)