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139_Physics ProblemsTechnical Physics

# 139_Physics ProblemsTechnical Physics - Chapter 5*P5.50 We...

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Chapter 5 141 *P5.50 We must consider separately the disk when it is in contact with the roof and when it has gone over the top into free fall. In the first case, we take x and y as parallel and perpendicular to the surface of the roof: F ma n mg n mg y y = + = = : cos cos θ θ 0 then friction is f n mg k k k = = μ μ θ cos FIG. P5.50 F ma f mg ma a g g x x k x x k = = = − = − °− ° = − : sin cos sin . cos sin . . θ µ θ θ 0 4 37 37 9 8 9 03 a f m s m s 2 2 The Frisbee goes ballistic with speed given by v v a x x v xf xi x f i xf 2 2 2 2 15 2 9 03 10 0 44 4 6 67 = + = + = = d i b g e j a f m s m s m m s m s 2 2 2 . . . For the free fall, we take x and y horizontal and vertical: v v a y y y y yf yi y f i f f 2 2 2 2 2 0 6 67 37 2 9 8 10 37 6 02 4 01 19 6 6 84 = + = ° + ° = + = d i b g e jd i b g . sin . sin . . . . m s m s m m m s
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