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t1_key_yellow - YELUJU F 012M 1. (26 points) Spies are...

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Unformatted text preview: YELUJU F 012M 1. (26 points) Spies are trying to determine the capabilities ofa new rocket. By analyzing video of a launch, they estimate that, at a certain altitude, the rocket accelerated at 19.6 m/sz, and from the size and shape ofthe rocket they estimate that its mass was 578,000 kg. and that the drag was 49,700 N. a.) (10 pts) Calculate the thrust that would have been generated by the rocket’s engine. .Jr- F : ’12 H~l> #4; r : F + w +1) F : MO. 3 000%. X (“ISL “323800 N. L) : mg : 578,000 1:5. >< CINE mist : Stewoo U, D : 44,7001). mt ll = P+w+1> == 170%290031 b.) (5 pts) Name one advantage that liquid-prOpellant engines have over solid-propellant engines- .— cm be. 5h; at mt Paste/fiat -— 66M he. ’i‘hromaflv < ’mei‘ Jé’dao— if diud’kéte) — gemaaflflié JDNM hijtvw 'H‘FV/Ji‘ c.) (6 pts) Name the two principal components that make up every set of chemical prepellants. .. are d.) (5 pts) True orcirele one) Thrust for a rocket is generated by the hot exhaust gases pushing against the air outside the rocket. 2. (24 points — 3 ptslitem) Match the items in the first column with those in the second; write the letter for the matching item in the blank space provided. There is only one correct answer for each item in the first column. E 1. apogee A. amount of force that an engine can generate B. a science fiction author E 2. Robert Goddard C. used for mapping entire surface of Earth A 3' 81‘3"“: “02216 D. amount of matter in an object C 4_ polar orbit E. point on an orbit farthest from Earth F. designed and built first successful liquid- Cl” 5. Geosynchronous propellant rocket engine equatorial orbit (GEO) G' weight of an Object K 6, weight H. wrote one of the first papers on the theory of O spaceflight _ 7- IOh“ Glenn 1. path taken between two circular orbits vi" 8. Werner von Braun J. used to relay communications near the equator and at low latitudes K. force of gravity acting on an object L. measure of how stretched an orbit is (compared to a perfect circle) M. force of resistance due to motion through the air N. part of engine where exhaust gases exit 0. first US. astronaut to orbit Earth P. speed and direction of an object’s motion Q. first human to orbit Earth . R. used to relay communications to high latitudes S. time that propellants can burn while generating thrust equal to their own weight T- principal engineer involved in launching first US. satellite (Explorer I) U. point on an orbit closest to Earth V. part of engine where propellants burn W. proposed the use of liquid—prepellant engines and the use ofthrust-vectoring to steer a rocket _J 3. (25 points) The recently announced plan for the US. to colonize the moon and then to send humans to Mars will pose great financial and technological challenges, as did the space program in the 1960’s. Assuming that the present—day motivation for reaching Mars includes both scientific curiosity and a desire to demonstrate technological prowess, explain how this compares with the U.S.’s motivations for the space program 46 years ago. Your answer should be in essay form, written in complete sentences. jam ’H’W ’iiw Um; Midi/SEN“ Jib lNM 0" (Lilia! (ifmanli'fliu fflum fig}: ioch JcipfqichC—EL WM; l. ' lg, at mm 4.7% - am If? Aim/Ki WtfigL r W/mfmm, nu Ufldfifirw' ix Sfm DO NOT WRITE BELOW THIS LINE 4. {25 points} A satellite that weighs zsoo N. at Earth‘s surface is moving on an elliptical orbit with perigee altitude of TUUU Iota and apogee altitude of 4?. I (14 km. a.) {9 pts} Caleulale the force of gravity acting on the satellite when i isfit an a tit-Jude oil‘ 120% km. a. a J a. sun: 1.31 R: £37? km F: GIMM W: F—T’LWE h: {loot} lam. tr-2L 3 15st:th CR”) 1 C3 93“ t “ELM/i manta) w: (4373 i‘“) a 29:31:: a. : (awash—Hams»? (€373 km tZoaa of = 0.32:; lrsfi'iCM/s?’ "- 5 M ham/5L : 3 at M , h.) {3 pts} Calculate tlte orbital period for the satellite. é : ‘WLCFfir )3 r; = + M I]? “gm/(L : Lissa: as. : 7am: {Cm + s57?£:m_ =W3373kmu r‘ 1; a at): imam tmgfi F _ 1(3).”l3’éxto5km35‘j e.) {3 pts} Calculate orbit's oeeentrieity. _ CR+ka-(R+hf,) a ‘ m "$5M $5 ism. {WZUEH -._ ...
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t1_key_yellow - YELUJU F 012M 1. (26 points) Spies are...

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