Which will require more energy heating a 2.0kg block of lead by 30K or heating a 4.0 kg of copper by 5 K?
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Both copper and lead will require equivalent amount of energy.
Specific heat capacity of lead - 125.6 J/kg K
Specific heat capacity of copper is - 376.81 J/kg K
Heat energy required for lead block
Q = mc∆t
Q = 2*125.6*30
Q = 7536 J
Heat energy required for copper block
Q = mc∆t
Q = 4*376.81*5
Q = 7536.2 J
Thus, both the elements, i.e lead and copper will require equivalent amount of energy for heating, under given circumstances.
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