Question

1. A car's engine block is made of (a) Iron, (b) Copper, (c) Tungsten and has a mass of 210 kg.
How much heat is absorbed by the engine when its temperature is raised from
(a) 10° C to 91°C? (b) 13° C to 97° C? (c) 14° C to 98° C?

Answer 1

Answer:

i) Heat required to raise temperature of iron is

$Q_{iron} = 7.55 \times 10^6 J$

ii) Heat require to raise temperature of copper is

$Q_{copper} = 6.79 \times 10^6 J$

iii) Heat require to raise temperature of tungsten is

$Q_{tung} = 2.36 \times 10^6 J$

Explanation:

As we know that specific heat capacity of

i) Iron is 444 J/kg C

so heat required to raise its temperature is given as

$Q_{iron} = m s \Delta T$

$Q_{iron} = 210(444)(91 - 10)$

$Q_{iron} = 7.55 \times 10^6 J$

ii) Copper specific heat is 385 J/kg C

so heat required to raise its temperature is given as

$Q_{copper} = m s \Delta T$

$Q_{copper} = 210(385)(97 - 13)$

$Q_{copper} = 6.79 \times 10^6 J$

iii) Tungsten specific heat capacity is given as 134 J/kg C

$Q_{tung} = m s \Delta T$

$Q_{tung} = 210(134)(98 - 14)$

$Q_{tung} = 2.36 \times 10^6 J$