Một con tàu vũ trụ có khối lượng m = 1000 kg đang bay quanh Trái Đất ở độ cao bằng hai lần bán kính Trái Đất. Cho biết gia tốc rơi tự do ở mặt đất là g = 9,8 m/s2. Lực hấp dẫn của Trái Đất tác dụng lên nó bằng 

4900 N.    

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Một số câu hỏi khác có thể bạn quan tâm.

• Choose a word that has different stress pattern:

  minority            refreshment                constancy               enthusiasm

• Choose a word that has different stress pattern:

  brighten            loyalty              donation               wounded

• Choose a word that has different stress pattern:

  gratitude         acquaintance                 apartment                 appreciate

• Choose the correct sentence which is built from the words and phrases given:

  Europe's 710 million people / 11% of the world's population

• Choose the word that has the underlined part pronounced differently from the rest:  

  effective                eradicate                 enthusiastic            effort

   

• Choose the correct sentence which is built from the words and phrases given:

  North America / home/ 514 million / South America / 371 million / Australia / 21 million

• Choose the word that has the underlined part pronounced differently from the rest:  

  campaign              clap                craft                 gratitude

• Choose the word that has the underlined part pronounced differently from the rest:  

  mutual                universal                usual               survey

• Choose the word that has the underlined part pronounced differently from the rest:  

  strategy               general           geography             great

• Choose one sentence that has the same meaning as the root one:

  They say that the world's population reached over 6.70 billion in February 2008.