Question

3-25. Figure P3.250 shows vectors A and B.Find vector uch that A+B+-6 Write your answver in component foem Flg, P3.25 3-39. .Tom is climbing a 3.0-m-long ladder that leans against a vertical wal, contacting the wall 2.5 m above the ground.His weight of 680 N is a vector pointing verticaly downward. (Weight is measured in meautons, abbeeviated N.) What are the components of Tom's weight parallel and perpendicular to the laddes 3-43. Figure P3.430 shows three ropes tied together in a knot.One of your friends pulls on a rope with 3.0 units of force and another pulls on a second rope with 50 units of force. How hard and in what direction must you puall on the third rope to keep the knot from moving? Fig. P3.43

Answer 1

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25)

$\overrightarrow{A}=4Cos60 i +4Sin60 j=2 i +3.4641 j$

$\overrightarrow{B}=3Cos(360-20) i +3Sin(360-20) j=2.819 i -1.026 j$

$\overrightarrow{A}+\overrightarrow{B}+\overrightarrow{C}=0$

$2i +3.4641 j +2.819 i-1.026 j+\overrightarrow{C}=0$

$\overrightarrow{C}=-4.819 i-2.438 j$