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Practice_Q7_1

# Practice_Q7_1 - b How much thrust(force do the first stage...

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Practice Quiz 7 Physics 7B Winter 2010 Feb. 24, 2010 The Apollo program, which sent astronauts to the moon, used the SaturnV rockets. The Saturn V was a multistage liquid-fuel expendable rocket. The first stage had a dry weight of 131,000 kg and a fully- fueled weight of 2.3 million kg). The engines of the first stage were fired for 168 seconds. At the time of the first stage engine cutoff, the rocket had an altitude of 68 km and was moving at about 2390 m/s. The second and third stages had combined fully-fueled weight of 600,000 kg. a) What is the total impulse provide by the first stage to the upper two stages of the Rocket?
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Unformatted text preview: b) How much thrust (force) do the first stage rocket engines generate? c) After the first stage engine cutoff, the first stage is now dry of fuel and is jettisoned using explosive charges. The explosive charges give a rapid impulse to the upper stages, after which they are traveling at 2900 m/s. How fast is the empty first stage traveling after being jettisoned? d) If we neglect frictional air resistance, how much energy is released when the empty first stage hits the ground (or ocean). To how many tones of TNT (1 ton of TNT releases 4.184 gigajoules) is this equivalent?...
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