Q7_7B_W10_Solution

# Q7_7B_W10_Solution - Name: Rubric Last , First DL Section:...

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Name: Rubric , DL Section: Last First Office Use Quiz 7 Physics 7B Winter 2010 Feb. 24, 2010 Consider a 0.2 kg model rocket. The rocket is launched using an Estes “C” engine which burns for one second and provides a total of 10.0 Newton-seconds of impulse. For all the following questions, assume that there is no air resistance and that the acceleration due to gravity ( g ) equals 10 m/s 2 . a) Assume that you aim the rocket straight upward. How much thrust (force) will the rocket engine generate during the one second lift phase? J = F t F = J / t = 10.0 Ns/1.0 s = 10 N Q [10]: J = P = F t => F = 10 N W [9]: Same as Q but adds or subtracts 2N for gravity, may have incorrectly assigned units E[5]: F = mg = 2N R [3]: Some progress w/in model. b) Assume that the rocket reaches a height of twenty meters during the one second burn of the engine (lift phase). How much higher will the rocket travel after the lift phase is completed? First use the definition of Impulse to determine the velocity of the rocket after the lift phase, then

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## This note was uploaded on 09/08/2010 for the course PHY 7B PHY7B taught by Professor Cebra during the Winter '10 term at UC Davis.

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Q7_7B_W10_Solution - Name: Rubric Last , First DL Section:...

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