Q7_7B_W10 - off the front of the rocket (and also deploys a...

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Name: , 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? 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? c) At the very top of the flight of the full rocket, another charge is fired which pops the nose cone
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Unformatted text preview: off the front of the rocket (and also deploys a parachute to bring the body of the rocket down slowly). The nose cone has a mass of 0.05 kg. The mass of the rest of the rocket is 0.15 kg. The rocket body recoils from this charge with a velocity of 1 m/s. How far from the launch site will the nose cone land if the rocket were horizontal when the ejection charge fired? This is a multi-step problem: 1) Use momentum conservation to get the horizontal velocity of the nose cone. The nose cone will hit the ground with a vertical velocity of 45 m/s. 2) Use the definition of impulse to determine the time. 3) Distance equals velocity times time. 2 ) 2 / 1 ( mv KE mgh PE p dt F J v m p a m F...
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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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