פתרונות לתרגול פרקטיקות כבידה דינמיקה .(ללא שיקולי אנרגיה )

הכוח היחיד הפועל על הלוויין הוא כוח הכבידה האוניברסלי.

נכתוב את משוואת התנועה המעגלית:

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נבטא את רדיוס מסלול תנועת הלוויין כסכום של רדיוס כדור הארץ וגובה הלוויין מעל לכדור הארץ.

«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mstyle mathsize=¨20px¨»«mi mathvariant=¨bold¨ mathcolor=¨#0000FF¨»G«/mi»«mo mathvariant=¨bold¨ mathcolor=¨#0000FF¨»§#183;«/mo»«msub»«mi mathvariant=¨bold¨ mathcolor=¨#0000FF¨»M«/mi»«mi mathvariant=¨bold¨ mathcolor=¨#0000FF¨»E«/mi»«/msub»«mo mathvariant=¨bold¨ mathcolor=¨#0000FF¨»=«/mo»«msup»«mfrac mathcolor=¨#0000FF¨»«mrow»«mn mathvariant=¨bold¨»4«/mn»«mo mathvariant=¨bold¨»§#183;«/mo»«mi mathvariant=¨bold¨»§#960;«/mi»«/mrow»«msup»«mi mathvariant=¨bold¨»T«/mi»«mn mathvariant=¨bold¨»2«/mn»«/msup»«/mfrac»«mn mathvariant=¨bold¨ mathcolor=¨#0000FF¨»2«/mn»«/msup»«mo mathvariant=¨bold¨ mathcolor=¨#0000FF¨»§#183;«/mo»«msup»«mi mathvariant=¨bold¨ mathcolor=¨#0000FF¨»R«/mi»«mn mathvariant=¨bold¨ mathcolor=¨#0000FF¨»3«/mn»«/msup»«mspace linebreak=¨newline¨/»«mspace linebreak=¨newline¨/»«mi mathvariant=¨bold¨ mathcolor=¨#0000FF¨»G«/mi»«mo mathvariant=¨bold¨ mathcolor=¨#0000FF¨»§#183;«/mo»«msub»«mi mathvariant=¨bold¨ mathcolor=¨#0000FF¨»M«/mi»«mi mathvariant=¨bold¨ mathcolor=¨#0000FF¨»E«/mi»«/msub»«mo mathvariant=¨bold¨ mathcolor=¨#0000FF¨»=«/mo»«msup»«mfrac mathcolor=¨#0000FF¨»«mrow»«mn mathvariant=¨bold¨»4«/mn»«mo mathvariant=¨bold¨»§#183;«/mo»«mi mathvariant=¨bold¨»§#960;«/mi»«/mrow»«msup»«mi mathvariant=¨bold¨»T«/mi»«mn mathvariant=¨bold¨»2«/mn»«/msup»«/mfrac»«mn mathvariant=¨bold¨ mathcolor=¨#0000FF¨»2«/mn»«/msup»«mo mathvariant=¨bold¨ mathcolor=¨#0000FF¨»§#183;«/mo»«msup»«mrow mathcolor=¨#0000FF¨»«mo stretchy=¨true¨ mathvariant=¨bold¨»(«/mo»«msub»«mi mathvariant=¨bold¨»R«/mi»«mi mathvariant=¨bold¨»E«/mi»«/msub»«mo mathvariant=¨bold¨»+«/mo»«mi mathvariant=¨bold¨»h«/mi»«mo stretchy=¨true¨ mathvariant=¨bold¨»)«/mo»«/mrow»«mn mathvariant=¨bold¨ mathcolor=¨#0000FF¨»3«/mn»«/msup»«mspace linebreak=¨newline¨/»«mspace linebreak=¨newline¨/»«msup»«mrow mathcolor=¨#0000FF¨»«mo mathvariant=¨bold¨ stretchy=¨true¨»(«/mo»«msub»«mi mathvariant=¨bold¨»R«/mi»«mi mathvariant=¨bold¨»E«/mi»«/msub»«mo mathvariant=¨bold¨»+«/mo»«mi mathvariant=¨bold¨»h«/mi»«mo mathvariant=¨bold¨ stretchy=¨true¨»)«/mo»«/mrow»«mn mathvariant=¨bold¨ mathcolor=¨#0000FF¨»3«/mn»«/msup»«mo mathvariant=¨bold¨ mathcolor=¨#0000FF¨»=«/mo»«mfrac mathcolor=¨#0000FF¨»«mrow»«mi mathvariant=¨bold¨»G«/mi»«mo mathvariant=¨bold¨»§#183;«/mo»«msub»«mi mathvariant=¨bold¨»M«/mi»«mi mathvariant=¨bold¨»E«/mi»«/msub»«mo mathvariant=¨bold¨»§#183;«/mo»«msup»«mi mathvariant=¨bold¨»T«/mi»«mn mathvariant=¨bold¨»2«/mn»«/msup»«/mrow»«mrow»«mn mathvariant=¨bold¨»4«/mn»«mo mathvariant=¨bold¨»§#183;«/mo»«msup»«mi mathvariant=¨bold¨»§#960;«/mi»«mn mathvariant=¨bold¨»2«/mn»«/msup»«/mrow»«/mfrac»«mspace linebreak=¨newline¨/»«mspace linebreak=¨newline¨/»«msub»«mi mathvariant=¨bold¨ mathcolor=¨#0000FF¨»R«/mi»«mi mathvariant=¨bold¨ mathcolor=¨#0000FF¨»E«/mi»«/msub»«mo mathvariant=¨bold¨ mathcolor=¨#0000FF¨»+«/mo»«mi mathvariant=¨bold¨ mathcolor=¨#0000FF¨»h«/mi»«mo mathvariant=¨bold¨ mathcolor=¨#0000FF¨»=«/mo»«msup»«mrow mathcolor=¨#0000FF¨»«mo stretchy=¨true¨ mathvariant=¨bold¨»(«/mo»«mfrac»«mrow»«mi mathvariant=¨bold¨»G«/mi»«mo mathvariant=¨bold¨»§#183;«/mo»«msub»«mi mathvariant=¨bold¨»M«/mi»«mi mathvariant=¨bold¨»E«/mi»«/msub»«mo mathvariant=¨bold¨»§#183;«/mo»«msup»«mi mathvariant=¨bold¨»T«/mi»«mn mathvariant=¨bold¨»2«/mn»«/msup»«/mrow»«mrow»«mn mathvariant=¨bold¨»4«/mn»«mo mathvariant=¨bold¨»§#183;«/mo»«msup»«mi mathvariant=¨bold¨»§#960;«/mi»«mn mathvariant=¨bold¨»2«/mn»«/msup»«/mrow»«/mfrac»«mo stretchy=¨true¨ mathvariant=¨bold¨»)«/mo»«/mrow»«mfrac mathcolor=¨#0000FF¨»«mn mathvariant=¨bold¨»1«/mn»«mn mathvariant=¨bold¨»2«/mn»«/mfrac»«/msup»«mspace linebreak=¨newline¨/»«mspace linebreak=¨newline¨/»«menclose mathcolor=¨#0000FF¨ notation=¨circle¨»«mi mathvariant=¨bold¨»h«/mi»«mo mathvariant=¨bold¨»=«/mo»«msup»«mrow»«mo stretchy=¨true¨ mathvariant=¨bold¨»(«/mo»«mfrac»«mrow»«mi mathvariant=¨bold¨»G«/mi»«mo mathvariant=¨bold¨»§#183;«/mo»«msub»«mi mathvariant=¨bold¨»M«/mi»«mi mathvariant=¨bold¨»E«/mi»«/msub»«mo mathvariant=¨bold¨»§#183;«/mo»«msup»«mi mathvariant=¨bold¨»T«/mi»«mn mathvariant=¨bold¨»2«/mn»«/msup»«/mrow»«mrow»«mn mathvariant=¨bold¨»4«/mn»«mo mathvariant=¨bold¨»§#183;«/mo»«msup»«mi mathvariant=¨bold¨»§#960;«/mi»«mn mathvariant=¨bold¨»2«/mn»«/msup»«/mrow»«/mfrac»«mo stretchy=¨true¨ mathvariant=¨bold¨»)«/mo»«/mrow»«mfrac»«mn mathvariant=¨bold¨»1«/mn»«mn mathvariant=¨bold¨»2«/mn»«/mfrac»«/msup»«mo mathvariant=¨bold¨»-«/mo»«msub»«mi mathvariant=¨bold¨»R«/mi»«mi mathvariant=¨bold¨»E«/mi»«/msub»«/menclose»«/mstyle»«/math»

נחשב את גובה הלוויין בהתאם לרדיוס כדור הארץ ומסתו .

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linebreak=¨newline¨/»«mspace linebreak=¨newline¨/»«mi mathvariant=¨bold¨ mathcolor=¨#0000FF¨»h«/mi»«mo mathvariant=¨bold¨ mathcolor=¨#0000FF¨»=«/mo»«msup»«mrow mathcolor=¨#0000FF¨»«mo mathvariant=¨bold¨ stretchy=¨true¨»(«/mo»«mfrac»«mrow»«mn mathvariant=¨bold¨»6«/mn»«mo mathvariant=¨bold¨».«/mo»«mn mathvariant=¨bold¨»67«/mn»«mo mathvariant=¨bold¨»§#183;«/mo»«msup»«mn mathvariant=¨bold¨»10«/mn»«mrow»«mo mathvariant=¨bold¨»-«/mo»«mn mathvariant=¨bold¨»11«/mn»«/mrow»«/msup»«mo mathvariant=¨bold¨»§#183;«/mo»«mn mathvariant=¨bold¨»5«/mn»«mo mathvariant=¨bold¨».«/mo»«mn mathvariant=¨bold¨»974«/mn»«mo mathvariant=¨bold¨»§#183;«/mo»«msup»«mn mathvariant=¨bold¨»10«/mn»«mn mathvariant=¨bold¨»24«/mn»«/msup»«mo mathvariant=¨bold¨»§#183;«/mo»«msup»«mrow»«mo stretchy=¨true¨ mathvariant=¨bold¨»(«/mo»«mn mathvariant=¨bold¨»24«/mn»«mo mathvariant=¨bold¨»§#183;«/mo»«mn mathvariant=¨bold¨»3«/mn»«mo mathvariant=¨bold¨»,«/mo»«mn mathvariant=¨bold¨»600«/mn»«mo stretchy=¨true¨ 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mathvariant=¨bold¨»6«/mn»«mo mathvariant=¨bold¨».«/mo»«mn mathvariant=¨bold¨»67«/mn»«mo mathvariant=¨bold¨»§#183;«/mo»«msup»«mn mathvariant=¨bold¨»10«/mn»«mrow»«mo mathvariant=¨bold¨»-«/mo»«mn mathvariant=¨bold¨»11«/mn»«/mrow»«/msup»«mo mathvariant=¨bold¨»§#183;«/mo»«mn mathvariant=¨bold¨»5«/mn»«mo mathvariant=¨bold¨».«/mo»«mn mathvariant=¨bold¨»974«/mn»«mo mathvariant=¨bold¨»§#183;«/mo»«msup»«mn mathvariant=¨bold¨»10«/mn»«mn mathvariant=¨bold¨»24«/mn»«/msup»«mo mathvariant=¨bold¨»§#183;«/mo»«msup»«mrow»«mo stretchy=¨true¨ mathvariant=¨bold¨»(«/mo»«mn mathvariant=¨bold¨»86«/mn»«mo mathvariant=¨bold¨»,«/mo»«mn mathvariant=¨bold¨»400«/mn»«mo stretchy=¨true¨ mathvariant=¨bold¨»)«/mo»«/mrow»«mn mathvariant=¨bold¨»2«/mn»«/msup»«/mrow»«mrow»«mn mathvariant=¨bold¨»4«/mn»«mo mathvariant=¨bold¨»§#183;«/mo»«msup»«mi mathvariant=¨bold¨»§#960;«/mi»«mn mathvariant=¨bold¨»2«/mn»«/msup»«/mrow»«/mfrac»«mo mathvariant=¨bold¨ stretchy=¨true¨»)«/mo»«/mrow»«mfrac mathcolor=¨#0000FF¨»«mn mathvariant=¨bold¨»1«/mn»«mn mathvariant=¨bold¨»3«/mn»«/mfrac»«/msup»«mo mathvariant=¨bold¨ mathcolor=¨#0000FF¨»-«/mo»«mn mathvariant=¨bold¨ mathcolor=¨#0000FF¨»6«/mn»«mo mathvariant=¨bold¨ mathcolor=¨#0000FF¨».«/mo»«mn mathvariant=¨bold¨ mathcolor=¨#0000FF¨»38«/mn»«mo mathvariant=¨bold¨ mathcolor=¨#0000FF¨»§#183;«/mo»«msup»«mn mathvariant=¨bold¨ mathcolor=¨#0000FF¨»10«/mn»«mn mathvariant=¨bold¨ mathcolor=¨#0000FF¨»6«/mn»«/msup»«mspace linebreak=¨newline¨/»«mspace linebreak=¨newline¨/»«mi mathvariant=¨bold¨ mathcolor=¨#0000FF¨»h«/mi»«mo mathvariant=¨bold¨ mathcolor=¨#0000FF¨»=«/mo»«msup»«mrow mathcolor=¨#0000FF¨»«mo mathvariant=¨bold¨ stretchy=¨true¨»(«/mo»«mfrac»«mrow»«mn mathvariant=¨bold¨»2«/mn»«mo mathvariant=¨bold¨».«/mo»«mn mathvariant=¨bold¨»974«/mn»«mo mathvariant=¨bold¨»§#183;«/mo»«msup»«mn mathvariant=¨bold¨»10«/mn»«mn mathvariant=¨bold¨»24«/mn»«/msup»«/mrow»«mrow»«mn mathvariant=¨bold¨»4«/mn»«mo mathvariant=¨bold¨»§#183;«/mo»«msup»«mi mathvariant=¨bold¨»§#960;«/mi»«mn mathvariant=¨bold¨»2«/mn»«/msup»«/mrow»«/mfrac»«mo mathvariant=¨bold¨ stretchy=¨true¨»)«/mo»«/mrow»«mfrac mathcolor=¨#0000FF¨»«mn mathvariant=¨bold¨»1«/mn»«mn mathvariant=¨bold¨»3«/mn»«/mfrac»«/msup»«mo mathvariant=¨bold¨ mathcolor=¨#0000FF¨»-«/mo»«mn mathvariant=¨bold¨ mathcolor=¨#0000FF¨»6«/mn»«mo mathvariant=¨bold¨ mathcolor=¨#0000FF¨».«/mo»«mn mathvariant=¨bold¨ mathcolor=¨#0000FF¨»38«/mn»«mo mathvariant=¨bold¨ mathcolor=¨#0000FF¨»§#183;«/mo»«msup»«mn mathvariant=¨bold¨ mathcolor=¨#0000FF¨»10«/mn»«mn mathvariant=¨bold¨ mathcolor=¨#0000FF¨»6«/mn»«/msup»«mo mathvariant=¨bold¨ mathcolor=¨#0000FF¨»=«/mo»«msup»«mrow mathcolor=¨#0000FF¨»«mo mathvariant=¨bold¨ stretchy=¨true¨»(«/mo»«mn mathvariant=¨bold¨»7«/mn»«mo mathvariant=¨bold¨».«/mo»«mn mathvariant=¨bold¨»534«/mn»«mo mathvariant=¨bold¨»§#183;«/mo»«msup»«mn mathvariant=¨bold¨»10«/mn»«mn mathvariant=¨bold¨»22«/mn»«/msup»«mo mathvariant=¨bold¨ stretchy=¨true¨»)«/mo»«/mrow»«mfrac mathcolor=¨#0000FF¨»«mn mathvariant=¨bold¨»1«/mn»«mn mathvariant=¨bold¨»3«/mn»«/mfrac»«/msup»«mo mathvariant=¨bold¨ mathcolor=¨#0000FF¨»-«/mo»«mn mathvariant=¨bold¨ mathcolor=¨#0000FF¨»6«/mn»«mo mathvariant=¨bold¨ mathcolor=¨#0000FF¨».«/mo»«mn mathvariant=¨bold¨ mathcolor=¨#0000FF¨»38«/mn»«mo mathvariant=¨bold¨ mathcolor=¨#0000FF¨»§#183;«/mo»«msup»«mn mathvariant=¨bold¨ mathcolor=¨#0000FF¨»10«/mn»«mn mathvariant=¨bold¨ mathcolor=¨#0000FF¨»6«/mn»«/msup»«mspace linebreak=¨newline¨/»«mspace linebreak=¨newline¨/»«mi mathvariant=¨bold¨ mathcolor=¨#0000FF¨»h«/mi»«mo mathvariant=¨bold¨ mathcolor=¨#0000FF¨»=«/mo»«mn mathvariant=¨bold¨ mathcolor=¨#0000FF¨»42«/mn»«mo mathvariant=¨bold¨ mathcolor=¨#0000FF¨».«/mo»«mn mathvariant=¨bold¨ mathcolor=¨#0000FF¨»22«/mn»«mo mathvariant=¨bold¨ mathcolor=¨#0000FF¨»§#183;«/mo»«msup»«mn mathvariant=¨bold¨ mathcolor=¨#0000FF¨»10«/mn»«mn mathvariant=¨bold¨ mathcolor=¨#0000FF¨»6«/mn»«/msup»«mo mathvariant=¨bold¨ mathcolor=¨#0000FF¨»-«/mo»«mn mathvariant=¨bold¨ mathcolor=¨#0000FF¨»6«/mn»«mo mathvariant=¨bold¨ mathcolor=¨#0000FF¨».«/mo»«mn mathvariant=¨bold¨ mathcolor=¨#0000FF¨»38«/mn»«mo mathvariant=¨bold¨ mathcolor=¨#0000FF¨»§#183;«/mo»«msup»«mn mathvariant=¨bold¨ mathcolor=¨#0000FF¨»10«/mn»«mn mathvariant=¨bold¨ mathcolor=¨#0000FF¨»6«/mn»«/msup»«mo mathvariant=¨bold¨ mathcolor=¨#0000FF¨»=«/mo»«mn mathvariant=¨bold¨ mathcolor=¨#0000FF¨»35«/mn»«mo mathvariant=¨bold¨ mathcolor=¨#0000FF¨».«/mo»«mn mathvariant=¨bold¨ mathcolor=¨#0000FF¨»84«/mn»«mo mathvariant=¨bold¨ mathcolor=¨#0000FF¨»§#183;«/mo»«msup»«mn mathvariant=¨bold¨ mathcolor=¨#0000FF¨»10«/mn»«mn mathvariant=¨bold¨ mathcolor=¨#0000FF¨»6«/mn»«/msup»«mi mathvariant=¨bold¨ mathcolor=¨#0000FF¨»m«/mi»«/mstyle»«/math»

לכן, כדי שלווייני התקשורת הנעים סביב כדור הארץ ימצאו מעל נקודה קבועה הם חייבים לנוע בגובה של 35.84 מליון מטרים מעל פני כדור הארץ.