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Jika massa Bumi , massa Bulan , dan jarak pusat bu...

Jika massa Bumi begin mathsize 14px style open parentheses m subscript straight B close parentheses equals 5 , 97 cross times 10 to the power of 24 blank kg end style, massa Bulan begin mathsize 14px style open parentheses m subscript straight b close parentheses equals 7 , 35 cross times 10 to the power of 22 blank kg end style, dan jarak pusat bumi dan pusat bulan begin mathsize 14px style open parentheses r close parentheses equals 3 , 84 cross times 10 to the power of 8 blank straight m end style, tentukan besar gaya gravitasi antara Bumi dan Bulan!

Jawaban:

Gunakan perumusan hukum gravitasi Newton.

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row F equals cell G fraction numerator m subscript straight B m subscript straight b over denominator r squared end fraction end cell row blank equals cell 6 , 67 cross times 10 to the power of negative 11 end exponent Nm squared over kg squared cross times fraction numerator 5 , 97 cross times 10 to the power of 24 blank kg open parentheses 7 , 35 cross times 10 to the power of 22 blank kg close parentheses over denominator open parentheses 3 , 84 cross times 10 to the power of 8 blank straight m close parentheses squared end fraction end cell row blank equals cell 1 , 98 cross times 10 to the power of 20 blank straight N end cell end table end style 

Dengan demikian, besar gaya gravitasi antara Bumi dan Bulan adalah begin mathsize 14px style 1 , 98 cross times 10 to the power of 20 blank straight N end style.

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