121_Physics ProblemsTechnical Physics

121_Physics ProblemsTechnical Physics - Chapter 5 P5.11 (a)...

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Chapter 5 123 P5.11 (a) FF F i j =+= + 12 20 0 15 0 . ± . ± ej N Fa i j a ai j =+ = m :. ± . ± . . ± . ± 20 0 15 0 5 00 400 300 ms 2 or a == ° 500 369 .. ms a t 2 θ (b) F F m x y 2 2 2 150 600 750 15 0 60 0 13 0 130 27 5 13 0 5 00 550 260 608 = = + = = = ° .c o s . . .s i n . . . ± . ± . ± . ± . . ± . ± . N N N N m s m s at 25.3 22 Fi j i j a a j FIG. P5.11 P5.12 We find acceleration: rrv a ij a a j fi i tt −= + −= =− 1 2 420 120 0720 583 458 2 2 . ±± . ± . ± . m 3.30 m =0+ 1 2 s s 2 2 af Now = m becomes FF a j j j g m += + 2 2 2 280 980 16 3 14 6 . ± . ± . ± . kg 5.83 4.58 m s kg m s N bg P5.13 (a) You and the earth exert equal forces on each other: mg Ma ye e = . If your mass is 70.0 kg, a e = × = 70 0 598 10 10 24
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