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physics_ch12homework

# physics_ch12homework - C hapter 12 Homewor k 7 A typical...

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Chapter 12 Homework 7. A typical adult human has a mass of about 70 kg. (a) What force does a full moon exert on such a human when it is directly overhead with its center 378,000 km away? = FM GmMmr2 = . × - . × ( ) . × 6 67 10 11 N·m2kg27 35 1022 kg 70 kg 3 78 108 m2 = . × - 2 40 10 3 N (b) Compare this force with the force exerted on the human by the earth. = FE GmEmr2 = . × - . × ( ) . × 6 67 10 11 N·m2kg25 97 1024 kg 70 kg 6 38 106 m2 = 685 N = . × - = . % FMFE 2 40 10 3 N685 N 0 0004 14. Use the mass and radius of the dwarf planet Pluto to calculate the acceleration due to gravity at the surface of Pluto. = gP GmPRP2 = . × - . × . × 6 67 10 11 N·m2kg21 5 1022 kg1 15 106 m2 = . / 0 757 m s2 15. At what distance above the surface of the earth is the acceleration due to the earth's gravity 0.980 m / s 2 if the acceleration due to gravity at the surface has magnitude 9.80 m/s 2 ? = ag GmERE2

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physics_ch12homework - C hapter 12 Homewor k 7 A typical...

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