A woman at an airport is towing her 17.0 kg suitcase at constant speed by pullin

Question

A woman at an airport is towing her 17.0 kg suitcase at constant speed by pullingon the strap at an angle of ? above thehorizontal (Fig. P4.40). She pulls on the strap witha 34.0 N force, and thefriction force on the suitcase is 14.0 N. (a) What angle does the strap make with the horizontal? (b) What normal force does the ground exert on thesuitcase? 167 N Please disregard the 167, it can't be deleted.

Explanation / Answer

a) She is pulling the suit case with constant speed. Sothat         F cos -Ffric = 0 ==> cos = Ffric / F = 14 /34 = 0.4117    ==> = 65.68o b) Normal force N = mg sin - F sin = (17 * 9.8 - 34 ) sin65.68 = 120.83 N

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