How much heat energy is required to raise the temperature of 5 kilograms of coal from 20°c to 220°c?
a. 1,314,718 j
b. 314 j
c. 4,187,000 j
d. 6,573 j

Given:

                5 kg of coal

                T1 = 20°C, T2 = 220°C

Required:

                Q(heat energy)

                Solution:

                The specific heat of coal (bituminous) is 1.315 kJ/kg-K

                Q = mcp(T2-T1)

                Q = 5kg (1.315 kJ/kg-K) (220 – 20)

                Note that T(°C) = T(K)

                Q = 1315 kJ or 1315000 J

                Since  1315000 J is close to 1314718 J, the answer is letter A.

v=ir = 3x15 =45 v

c because the news are a source of information of things that happen on the daily and shows evidence about that particular topic