A drilling machine of power P watts is u...

A drilling machine of power P watts is used to drill a hole in copper block of mass M kg. If the spcific heat of coper is `sjkg^(-1) .^(@)C^(-1)` and 40% of the powder is lost due to theating of the machine, the rise in the temperature of the block in T seconds will be (in `.^(@)C`)

`(0.6 PT)/(Ms)`

`(0.6P)/(MsT)`

`(0.4PT)/(Ms)`

`(0.4P)/(MsT)`

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