195_Physics ProblemsTechnical Physics

# 195_Physics ProblemsTechnical Physics - Chapter 7*P7.17(a b...

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Chapter 7 197 *P7.17 (a) F kxk xk xk xy xx x hh applied leaf helper N N m N m m N Nm m =+ = + ×= × + × = × × = AA A A A 0 55 5 5 5 5 10 5 25 10 3 60 10 0 5 68 10 885 10 0768 bg .. . . . . (b) Wk x k x =+= × F H G I K J 1 2 1 2 1 2 525 10 1 2 360 10 0268 168 10 22 5 2 5 2 5 . . . N m m N m m J a f a f P7.18 (a) Wd Wx x d x W i f =⋅ =+− ° =+−= z z Fr 15 000 10 000 25 000 0 15 000 10 000 2 25 000 3 9 00 1 80 1 80 9 00 2 0 0600 23 0 N m N m kJ kJ kJ kJ 2 m m ej cos ... . . . (b) Similarly, W W = 15 0 1 00 10 0 1 00 2 25 0 1 00 3 11 7 2 3 . kN m kN m m kN m m kJ , larger by 29.6% 2 af a f P7.19 400 1 2 0100 2 J m = k a f ∴= k 800 N m and to stretch the spring to 0.200 m requires W =− = 1 2 800 0 200 4 00 12 0 2 a fa f . J P7.20 (a) The radius to the object makes angle θ with the horizontal, so its weight makes angle with the negative side of the
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