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ICSE Class 10 Answered

a 10K.W drilling machine is used to drill a small aluminium block of mass 8Kgs. what is the rise in temperature in 2.5minutes assuming 50% of power is lost to the surrounding [heat capacity of aluminium=0.91J/gm c]
Asked by bharadwajlucky26 | 12 Nov, 2018, 03:29: PM
answered-by-expert Expert Answer
Heat energy absorbed = Power×time×efficiency = 10000×2.5×60×.5 = 750 kJ  ......................................(1)
 
Heat energy absorbed by Al block to raise the temperature by ΔT = mass×Specific heat×ΔT = 8×0.91×1000×ΔT  J    ..................(2)
 
By equating eqn.(1) and (2), we get ΔT = 103 °C
 
Answered by Thiyagarajan K | 12 Nov, 2018, 09:53: PM

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