178_Physics ProblemsTechnical Physics

178_Physics ProblemsTechnical Physics - 180 P6.55 Circular...

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180 Circular Motion and Other Applications of Newton’s Laws P6.55 Take x -axis up the hill F ma T mg ma a T m g Fm a T m g T mg a g g ag xx yy =+ = =− =+− = = :s i n s i n sin sin :c o s c o s cos cos cos sin cos sin cos tan sin θφ φ θ φθ 0 bg *P6.56 (a) The speed of the bag is 27 4 6 38 123 π . . m s ms af = . The total force on it must add to ma c == 30 kg 1 23 746 612 2 b g . . . m N n mg f s a c x y FIG. P6.56 a f n n n f s s s = = = o s s i n . i n c o s . cos . sin 20 20 6 12 20 20 30 9 8 0 20 6 12 20 N kg m s N 2 ej Substitute: ff f f ss s s sin cos sin . cos sin .. 20 20 20 20 20 294 292 294 168 106 2 +− = = N N N N a f (b) v 9 4 34 147 . . m s ma c 30 1 47 794 813 2 kg m s m N b g . . . fn n f f f n f n s s s s s s s cos sin . sin cos cos
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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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