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m1 = 1 kg
t1 = 20*C
m2 = 250 g = 0,25 kg - masa wody w szklance
t2 = 80*C
szukane:
tk = ?
BILANS ENERGII WEWNĘTRZNEJ
Q pobrane = Q oddane
m1C(tk - t1) = m2C(t2 - tk) /:C
m1(tk - t1) = m2(t2 - tk)
m1tk - m1t1 = m2t2 - m2tk
m1tk + m2tk = m1t1 + m2t2
tk(m1 + m2) = m1t1 + m2t2 /:(m1+m2)
tk = (m1t1 + m2t2)/(m1+m2)
tk = (1kg * 20*C + 0,25kg * 80*C)/(1kg + 0,25kg) = 40/1,25 *C
tk = 32*C