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Published byElin Forsberg Modified over 5 years ago
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Rube-Goldberg Device EF_ Sec. A-2 Fall 2006 Rube-Goldberg Device
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Our Team Wes Tipton James Rushford George Quarles EF_151 Sec. A-2
Fall 2006 Rube-Goldberg Device
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The Dam EF_ Sec. A-2 Fall 2006 Rube-Goldberg Device
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Purpose Convert potential gravitational energy to useful electrical energy Stop water flow after a certain amount of water has passed through system with gravitational potential energy EF_ Sec. A-2 Fall 2006 Rube-Goldberg Device
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Overview EF_ Sec. A-2 Fall 2006 Rube-Goldberg Device
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Demonstration EF_ Sec. A-2 Fall 2006 Rube-Goldberg Device
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Energy Conversions First Conservation Of Energy PE = KE gh = ½ v^2
Theoretical v_water = 6.26 m/s EF_ Sec. A-2 Fall 2006 Rube-Goldberg Device
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Energy Conversions Second Conservation Of Energy
Theoretical E_out = ½ m(6.26)^2 m= change in volume of water (about 2L = 2Kg) Actual E_out = measured Measured: Volts/Resistance = current Current x Voltage = watts = .036 J/sec Watts x time = Joules Measure time (in sec.) for change in volume Actual/Theoretical x100 = %Efficiency EF_ Sec. A-2 Fall 2006 Rube-Goldberg Device
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Energy Conversions Third Potential Energy
Float triggers elevated weight Force of weight due to gravity is greater than resistance forces on valve—pulls valve shut mgh > M_s Water stops flowing, system stops EF_ Sec. A-2 Fall 2006 Rube-Goldberg Device
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Conclusions Inefficient System
Energy is lost during impact of water droplets to spoon Resistance Forces Water in tubing Friction on turbine But still pretty awesome EF_ Sec. A-2 Fall 2006 Rube-Goldberg Device
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