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A woman at an airport is towing her 21.0 kg suitcase at constant speed by pulling on the strap at an angle of è above the horizontal (Fig. P4.40). She pulls on the strap with a 34.0 N force, and the friction force on the suitcase is 11.0 N.

(a) What angle does the strap make with the horizontal?
(b) What normal force does the ground exert on the suitcase?

  • physics -

    a. Fh - Ff = ma = 0. Because a = 0.
    34*cosA - 11 = 0,
    34cosA = 11,
    cosA = 0.324,
    A = 71 Deg.

    b. Fv = mg = 21kg * 9.8N/kg = 206N.

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