Which of the following cases (if any) requires the greatest amount of heat? In each case the material is the same. A. 1.5 kg of the material is to be heated by 7.0 C° B. 3.0 kg of the material is to be heated by 3.5 C°. C. 0.50 kg of the material is to be heated by 21 C° D .The amount of heat required is the same in each of the three previous cases
Answers
All because it depends on fuel
Explanation:
But if its wood it will not burn in any of the cases and if it's hydrogen , LPG ,CNG IT will burn in all the cases.
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Given: A material is given and it is heated in three different ways
To find: The case which requires maximum heat
Explanation: When an object is heated, its temperature changes over a period of time. The heat that is required is given by the formula:
q = mst
where q is heat given, m is mass kf of gas and t is the temperature change of the material and s is the specific heat of the material.
Since material is same for all three cases, s is same for all of them. Therefore, heat given is directly proportional to mass and temperature change.
In first case: m= 1.5 kg, T = 7° C
q = 1.5*s* 7
= 10.5 s
In second case: m= 3 kg, T = 3.5° C
q = 3*s* 3.5
= 10.5 s
In third case: m= 0.5 kg, T = 21° C
q = 0.5 *s* 21
= 10.5 s
We observe that heat required is 10.5 s for all gases where s is specific heat of the material.
Therefore, option( D) heat required is same for all cases is the right answer.