Grading Ruberic

Points common errors 8 points if incorrect mass flow 9

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Unformatted text preview: but made math error along the way • 8 points if did not note location is independent of density • 6 points if did not find forces/moments on BOTH top and bottom portions (if doing it that way) Additive points: • 2 points for noting answer is independent of density • 2 points for recognizing that the location of force (yCP) must above point b for gate to open (or alternatively, finding the location where moment is equal to 0 knowing that is minimum) • 1 points for force on top portion* • 1 point for force on bottom portion* • 1 points for moments on top portion* • 1 points for moments on bottom portion* • 1 point for summing moments* *OR, alternatively, 5 points for using yCP equation and finding hcg • • 1 point for getting all the math correct #3: Full credit: 10 points Common errors: • 8 points if incorrect mass flow • 9 points if failed to simplify math • 8 points if wrong velocities and/or signs Additive points: • 1 points for setting up conservation of momentum equation in the x- direction • 1 point for assumptions/Control volume • 2 points for the correct velocities and signs in conservation equation • 2 points for correct dynamic pressure in momentum equation • 2 points for correct mass flow rate • 1 point for V2 • 1 point for correct h2 (Note, can be in any form) #4: Full credit: 10 points Common errors: • 8 points...
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