1) Determine the force of gravitational attraction between the earth(m=5.98*10^24kg) and a 70-kg physics student if the student is in an airplane at 4.950 meters above the earth's surface.

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asked by Charlie
  1. 1) Planet Zero has a mass of 5.0*10^23 kg and a radius of 2.0*10^6 meters. What is the acceleration of gravity on planet zero?

    2)Phobos, a satellite of Mars, has a radius of 11km and a mass of 10^16 kg. Its a bit lumpy, but let's assume its spherical to get a doable problem.
    (a) What is G on Phobos?
    3)Find the force of gravity between you and your pen if the writing device has the mass of 5.6 grams...estimate the difference.

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    posted by Charlie
  2. 686.3 kg

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