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pebbles
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Homework Statement
A 3.00 X 10^2 W electric immersion heater is used to heat a cup of water. The cup is made up of glass and its mass is 3.00 X10^2 g. It has 250 g of water at 15 degrees celsius. How much time is needed to bring water to boiling point. Assume no heat is lost and temp of cup is same as temp of water.
Homework Equations
...really have no idea what equation to use.
The Attempt at a Solution
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I appreciate any help.