Which requires more energy,increasing the temp. of a 1kg. block of aluminum by 20c or .............

Question

raising the temp of 500g. of water by 5c.?

Answer 1

Let's calculate.

1)Q for Al = mctheta=1*900*20=18000Joules

2)Q for water=mctheta=0.5*4200*5=10500J

So aluminium requires more energy.

Answer 2

specific heat of water is 4186 J/kgC

specific heat of Aluminum is 900 J/kgC

Ew = 4186 J/kgC x 0.5kg x 5 = 10465 J

Ea = 900 J/kgC x 1 x 20 = 18000 J

So the Al wins

.