A ` 10kW` drilling machine is used to drill a bore in a small aluminium block of mass `8.0kg`.How much is the rise in temperature of the block in `2.5 minutes`,assuming `50%` of power is used up in heating the machine itself or lost to the surroundings?Specific heat of aluminium=`0.19Jg^(-1)K^(-1)`

A copper block of mass 2.5kg is heated in a furnace to a temperature of 500°C and then placed on a large ice block. What is the maximum amount of ice that can melt?(Specific heat of copper = 0.39Jg^-1 K^-1 , latent heat of fusion of water = 335Jg^-1) .

A heating element using nichrome connected to a 230V supply draws an initial current of 3.2A which settles after a few seconds to a steady value of 2.8A. What is the steady temperature of the heating element if the room temperature is 27.0^(o)C ? Temperature coefficient of resistance of nichrome averaged over the temperature range involved is 1.70 x 10^(-4) ^(0)C^(-1)