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A hot piece of copper (cc = 386J/kg·K) of mass mc = 3kg and unknown initial temperature Tc is dropped into a container of water (cw = 4186 J/kg · K) of mass mw = 1 kg and initial temperature Tw = 293 K . By the time the system has reached equilibrium, ?mw = 0.1kg of the water has been converted to steam (Tv = 373K and Lv = 2.26 × 106 J/kg ).
(i) How much heat Qw has been transferred to the original mass mw of water?
(ii) What is the initial temperature Tc of the copper?
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A brick is released with no initial speed from the roof of a building and strikes the ground in 2.70 {rm s}, encountering no appreciable air drag. How tall is building? How fast is the brick moving just before it reaches the ground.
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