Midterm3[Spring_2015-2016] - AU 8 I UJLJaJl U3...

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Unformatted text preview: AU 8 I UJLJaJl U3 4_._‘>’J_t_.o§ll Libel—4:] American University of Sharjah coLHRHR OF ARTS HRH SCIHHCRS HHRRRTMHHT oH PHYSICS THIRD HRRM = SPRING am e HoHDRY, MRI! 09),, 201 H INSTRUCTOR: SRIHI EL RHHTIR PHYlO‘l SEC (Q?) ‘l 1300 AM =1 1:50) AM -ime Total 40 ____..-SE> oil/7 GVL * Make sure that you have five pages including this cover sheet with four questions. * Use your own calculator, hones are not allowed during the exam. llPage Q1-A) A 15.0 kg stone slides down at pointA with initial speed of 10.0 m/s, there is no friction between points A to B, but there is friction between B and the wall. The stone travels 100 m and then runs into a spring with force constant 2.00 N/m [spring also is over the rough track). The coefficient of kinetic friction between the stone and the horizontal ground is 0.20 (a) What is the speed of the stone when it reaches point B? (z-points) EA=EB -— '1. fi V‘El‘tfi‘é is _ 7i 74% 20 152%) 2: m0» {1%)‘3‘5’ z. \o *100 C20) é15m% :- 60 Saafimlg (b) What maximum distance will the stone compress the spring? [5-points) ”'8 Qoo—r KB Q1-B) Ifa force ofF = 5.0 N i + 7.0 N j‘ is acting on object, so the object displaced to (3.0 m, -2.0 m) in the xy—plane, what is the angle between the force and the displacement? (3-points) ,7 Cefice— - 'FA 4) g g fi %8 : g8.\ 2|Page /\ K0. 9 QZ-A) A 0.01 kg bullet is fired with initial velocity of 400 m/s toward a 20 kg wood initially at rest, as show. The bullet passes through the wood target completely and moved out the wood target with half of its initial speed. What is the maximum height (hmax) the target has swung above its original position? [5-points) Q2-B) A 1500 kg carl goes south when it hits by a 2000 kg car2 traveling west. If the total momentum of the wreckage after collision is 7200 [kg m/s], with the direction shown in the figure, what is the initial velocity of each car? (The two cars stick together after collision] (5-points] ‘ Q3-A) A 7.00 kg shell at rest explodes into two fra ments one wit of 2.00 kg and the other with a mass of 5.00 k . If the heavier fra ment ' ' ‘ mm the explosion, how much kinetic energy does the lighter one gain? (s-points] F) Kzlwm’: (—POZ'\ c” 1’ '19. 1,: w"? 0 = “K“ti‘ii 9— \©Q‘>’(LOS z > O :CQ>'Z/;l—¥g<_€‘3 Q, a ‘3 O B * Q3-B) A 1000 kg elevator carries a load of 800 kg. A constant force of 4000 N retards its motion upward (friction). What power, in kilowatts and in horsepower units, must the motor deliver to lift the fully loaded elevator With a constant speed Of 3.00 m/s? [lhp z 750 W] (Hint: this power is due to the tension force) [5-points) 4|Page Q4-A) A 5.00'kf'g chandelier is hanging by 1.50 m wire when it is suddenly hit by 3.00 kg object that was traveling horizontally at 12.0 m/s, the object embedded itself inside the chandelier. What is the tension in the wire immediately after the collision? [5-points] ...
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  • Spring '14
  • KathrynLynch
  • English

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