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k may b these equations Q =mc(Tf - Ti) Q =+/-mL

Homework Statement How much water remains unfrozen after 50.2kJ is transferred as heat from 260g of liquid water initially at its freezing point? Homework Equations The Attempt at a Solution

please do help sum1

Homework Statement When the temperature of a metal cylinder is raised from 0 degrees C to 100 C,its length increases by 0.23%. (a) Find the percent change in density. (b) What is the metal? Homework Equations ∇L = Lα∇T The Attempt at a Solution