# Physics 11th grade 'Heat' `

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1) While Laurie is boiling water to cook spaghetti, the phone rings, and all 1.5 kg of water boils away during her conversation.If the water was initially at 15℃, how much heat must have been gained for all of it to turn into a water vapor?

2)By January, the 3.0 kg of water in the birdbath in the Robyn's backyard has frozen to a temperature of 7.0℃. As the season changes, how much heat must be added to the water to make it a comfortable 25℃ for the birds?

• Physics 11th grade 'Heat' ` -

heat=mass*lf+ mass*cice*(7)+mass*cwater*25

This assumes an initial temp of the ice at MINUS 7C

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