Question

A cube of ice is taken from the freezer at -9.5 degree Celsius and placed in a 99 g aluminum calorimeter filled with 327 g of water at room temperature of 20.0 degree celsius. The final situation is observed to be all water at 17.0 degree Celsius.

What was the mass of the ice cube?
A laser used to weld detached retinas emits light with a wavelength of 652 in pulses that are 20.0 in duration. The average power expended during each pulse is 0.600 .

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