A 10 kW drilling machine is used to drill a bore in a small aluminium – McqOptions

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1.	A 10 kW drilling machine is used to drill a bore in a small aluminium block of mass 8 kg. Find the rise in temperature of the block in 2.5 minutes, assuming 50% power is used up in the heating machine itself or lost to the surroundings. (Specific heat of aluminium = 0.91 J g-1° C-1)
A.	103°C
B.	150°C
C.	206°C
D.	155°C
Answer» B. 150°C

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