Question

how much energy must be added to a 2-kg piece of glass with a specific heat of 644 j/(kgC) to increase its temperature from 10 c to 50 c ?

a.51,520 j
b.644,000j
c.12,880 j
d.77,280 j ?

Answer 1

formula for amount of heat dQ=m.c.dT = 2kg. 644 J/kgC.(50°-10°) = 51,520kJ or 51520 Joule

Answer 2

so answer a, is the only possible. But you can say the teacher that comma's are inappropriate here.

Answer 3

answer : a