F=GmM(moon)/R²-Man or Astro-man?mp3下载无损flac下载
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"Em I think I'll stay where I am.""Well gravity will help you do just exactly that."
"Well how much would I weigh on the moon?""The moon is much smaller than the Earth so you would weigh about...18 pounds."
"How much do you weigh?""About 105 pounds.""That's because the Earth's gravity pulls you downward with just that amount of force. "