192_Physics ProblemsTechnical Physics

192_Physics ProblemsTechnical Physics - 194 Energy and...

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194 Energy and Energy Transfer P7.4 (a) Wm g h == × = × −− 3 35 10 9 80 100 3 28 10 52 .. . ej af a f J J (b) Since Rm g = , W air resistance J =− × 328 10 2 . Section 7.3 The Scalar Product of Two Vectors P7.5 A = 500 . ; B = 900 . ; θ 50 0 . AB ⋅= = ° = AB cos . . cos . . 5 00 9 00 50 0 28 9 P7.6 A B i j k i j k + + + + AAA BBB xyz ±±± e j ii ij ik ji jj jk ki kj kk ⋅+ +⋅ + ⋅ + + xx xy xz yx yy yz zx zy zz ±± e j e j P7.7 (a) WF x F y =⋅ = + = ⋅ +− ⋅ = Fr 6 00 3 00 2 00 1 00 16 0 . a f N m N m J (b) = F H G I K J = +− + cos cos . . . 11 22 2 2 16 600 200 300 100 36 9 a f P7.8 We must first find the angle between the two vectors. It is: = ° −° − ° 360 118 90 0 132 20 0 Then Fv = ° Fv cos . . cos . 32 8 0 173 20 0 N m s bg or 533 . Nm s J s W FIG. P7.8 P7.9 (a) Aij . ± . ± Bij 400 . ± . ± = = + cos cos . 12 0 8 00 13 0 32 0 11 3 AB (b) Bijk =−+ . ± . ± . ± Ai j + . ± . ± cos = = AB 600 160 20 0 29 0 156 (c) j k + ± . ± . ± Bjk
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This note was uploaded on 12/14/2011 for the course PHY 203 taught by Professor Staff during the Fall '11 term at Indiana State University .

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