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Unformatted text preview: General Physics III Homework Assignments Cory poynter Homework Due Date: April 13 Problems: 20-6,9,15,23,26,33,35,52 6) aluminum cup (m a ) = 200g Specific heat of aluminum (c a ) = 900 J/kgC Water (m w ) = 800g Specific heat of water (c w ) = 4186 J/kgC Starting temperature (T i ) = 80C Drop in 1 minute T = 1.5C Temperature after minute = 78.5C Q = (m a c a + m w c w )T specific heat capacity = ((200g x 900 J/kgC) + (800g x 4186 J/kgC) x 1.5C = 5293.2J = . 5293 2J1min = . 5293 2J60sec = 88.22W 9) aluminum (m al ) = 100g Specific heat of aluminum (c al )= 0.215 cal/gC water(m w ) = 250g Specific heat of water(c w ) = 1 cal/gC Temperature of water = 10C copper (m cu) = 50.0g Specific heat of copper c cu = 0.0924 cal/gC Temperature of copper = 80C mass of unknown = 70.0g Temperature of unknown = 100C equilibrium temperature = 20C a) Q water + Q al = - Q copper- Q unknown Calorimetry Q water = m w c w T specific heat capacity = (250g)(1 cal/gC)(20C -10C)...
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