Question

Can you calculate the energy needed to increase the temperature of 100kg of iron by 40°C?

Answer 1

Answer:

1848000J

Explanation:

Given parameters:

Mass of iron  = 100kg

Temperature change  = 40°C

Unknown:

Energy needed to increase the temperature  = ?

Solution:

The amount of energy needed is given by the expression below:

     H  = m C Δt

m is the mass

c is the specific heat capacity

Δt is the change in temperature

  c for iron is 462J/kg°C

 Now insert the parameters and solve;

  H  = 100 x 462 x 40  = 1848000J

Answer 2

Answer: 177600 J or 177.6kJ

Explanation:

For this problem, we need to use q = mcAT

we have m = 10000, and AT= 40. The specific heat of iron is 0.444.

So now we can plug it in: q = 10000*.444*40 = 177600 J or 177.6kJ