Solutions to Homework 04

Solutions to Homework 04 - z) 2‘lzou I uALGLw ,7 Chapter...

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Unformatted text preview: z) 2‘lzou I uALGLw ,7 Chapter 4, Problem 3 In the amusement park ride known as Magic Mountain Superman, powerful magnets accelerate a car and its riders from rest to 30.1 m/s in a time of 8.74 s. The mass of the car and riders is 5.81 x 103 kg. Find the average net force exerted on the car and riders by the magnets. Number “2.0009267734553778 ’ Units N 2+: FMQ Chapter 4, Problem 8 An arrow, starting from rest, leaves the bow with a speed of 24.3 m/s. If the average force exerted on the arrow by the bow was increased 3 times and the arrow was accelerated over the same distance, then with what speed would the arrow leave the bow? Number : 42088834623921“ Units m/s 1 ‘L f\) ; (V,o -(' 20.} 2‘2; ': —-——Q! N} 2423c 42. ’-—‘7 Mg, ': 71’: '55) (V2 (U7, r2 x Hamel/«arc. C 7 (\l S’MC 9A (weak 6456a . M, \/‘q, l \/ ' (UL,— qL ’ f1» 28m a = E"? => Chapter 4, Problem 14 Airplane flight recorders must be able to survive catastrophic crashes. Therefore, they are typically encased in crash-resistant steel or titanium boxes that are subjected to rigorous testing. One of the tests is an impact shock test, in which the box must survive being thrown at high speeds against a barrier. A 45—kg box is thrown at a speed of 180 m/s and is brought to a halt in a collision that lasts for a time of 7.7 ms. What is the magnitude of the average net force that acts on the box during the collision? Number 1051948051948052 :UnitsN E F :— m (M~_'t/V"> = 4.081051 (—x _.——— Chapter 4, Problem 26 A space traveler weighs 643 N on Earth. What will the traveler weigh on another planet whose radius is 4 times that of earth and whose mass is 3 times that of earth? Number 120.5625 UnitsN reg/EL: G 7. {,6 5 1 Gwen PI" rfjbwé ,. Mflgjct/ 1 Trance: 2 6/ Quid Mameb/ rag) Chapter 4, Problem 36 A 81.0-kg person stands on a scale in an elevator. What is the apparent weight when the elevator is (a) accelerating upward with an acceleration of 2.32 m/sz, (b) moving upward at a constant speed, and (c) accelerating downward with an acceleration of 1.17 m/sz? (a) Number: 981.72 UnitsN 4) FN ; m5 +mq L a; g(_ 7 A/ (b) Number 793.8 UnitsN f—— (c) Number 699.03 VUnits N b) 6: M? r. 793-VZN ‘ / C) 7;: m5+masé€7M f“ /— Chapter 4, Problem 38 A car (m = 1780 kg) is parked on a road that rises 15.6 ° above the horizontal. What are the magnitudes of (a) the normal force and (b) the static frictional force that the ground exerts on the tires? (a) Number 16801.40781521835“UnitsN :F g; _M .3: O (b) Number#46910373898’12695 VUnitsN 3 " ’* "’ 5 ‘5 '. rx ,_. Chapter 4, Problem 50 The drawing shows a wire tooth brace used by orthodontists. The top-most tooth is protruding slightly, and the tension in the wire exerts two forces, Tand T, on this tooth in order to bring it back into alignment. If the forces have the same magnitude of 15.5 N, what is the magnitude of the net force exerted on the tooth by these forces? é?‘_:ZFiTE»TCI__ ____ I I IX # Tm” lx — 5”” f I /" M10 T 7—73.“ ’6 la 53' 5 a Chapter 4, Problem 58 The person in the drawing is standing on crutches. Assume that the force exerted on each crutch by the ground is directed along the crutch, as the force vectors in the drawing indicate. If the coefficient of static friction between a crutch and the ground is 0.812, determine the largest angle QMAX that the crutch can have just before it begins to slip on the floor. Number "39076598522386 Units ° 13 (A; 3 3; X \\ Chapter 4, Problem 67 In the drawing, the weight of the block on the table is 422 N and that of the hanging block is 185 N. Ignoring all frictional effects and assuming the pulley to be massless, find (a) the acceleration of the two blocks and (b) the tension in the cord. W! M, ; ,— (a) Number 2.9§§8204283§§“ Units In/s"2 9 (b) Number, 123616144975288 Units N Ml; Vi?— €BS+M @ E F: 5 m9. 3 Chapter 4, Problem 76 A 210-kg log is pulled up a ramp by means of a rope that is parallel to the surface of the ramp. The ramp is inclined at 26.0 ° with respect to the horizontal. The coefficient of kinetic friction between the log and the ramp is 0.894, and the log has an acceleration of 0.741 m/sz. Find the tension in the rope. Number 2711.4258437635'35 E Units N X 3% :87 max v)» ...
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Solutions to Homework 04 - z) 2‘lzou I uALGLw ,7 Chapter...

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