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    Relative mass, gravitational force, and tension

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    1. An astronaut orbits the earth in a space capsule whose height above the earth is equal to the earth's radius. How does the mass of the astronaut in the capsule compare to her mass on the earth?

    A It is equal to her mass on earth.
    B It is equal to one-half of her mass on earth.
    C It is equal to one-third of her mass on earth.
    D It is one-fourth her mass on earth.
    E It is equal to one-sixteenth her mass on earth.

    2. What is the magnitude of the gravitational force acting on a 79.5-kg student due to a 60.0-kg student sitting 2.25 m away in the lecture hall?

    A 3.14 x 10-9 N
    B 2.82 x 10-8 N
    C 7.91 x 10-10 N
    D 1.41 x 10-7 N
    E 6.29 x 10-8 N

    3. A rock is suspended from a string; and it accelerates downward. Which one of the following statements concerning the tension in the string is true?

    A The tension points downward.
    B The tension is less than the weight of the rock.
    C The tension is equal to the weight of the rock.
    D The tension is greater than the weight of the rock.
    E The tension is independent of the magnitude of the rock's acceleration.
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