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###### Extension Tke planet: in our Solar System orbit tre Sun ir almost circular orbit:. Skowr that the orbital speed cfa plane: 2t dstance ffom tze cente of the Sur 1 g1tren %}" GMThe mear distarce betiveen tke Su and tze Earth i: 1* 10" and tke mas? ~ t.e 120 x 10"k: Calcula e the orbita speed of-he Earth 28 it Tzvel: Icudte Sun: Tzere point betireen tke Earth ard the Mccn where tke ret ravitational field sTerzth zer? Atthi: point the Earth : gratitaticnal field strergth equa- magit

Extension Tke planet: in our Solar System orbit tre Sun ir almost circular orbit:. Skowr that the orbital speed cfa plane: 2t dstance ffom tze cente of the Sur 1 g1tren %}" GM The mear distarce betiveen tke Su and tze Earth i: 1* 10" and tke mas? ~ t.e 120 x 10"k: Calcula e the orbita speed of-he Earth 28 it Tzvel: Icudte Sun: Tzere point betireen tke Earth ard the Mccn where tke ret ravitational field sTerzth zer? Atthi: point the Earth : gratitaticnal field strergth equa- magitude but opposite direction the gravitational feld strength of the Moon Given tha:: 2283of Eartk mass 0f Moor calculate bow far this point is fom the certre of tbe Moon in teras of R; Where R i: tbe separation betireen tre centres ofthe Earth andtre Moon

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