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1d3t1s09 - Physics 1D03 Sununer2009 TEST 1 Instructor Dr A...

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Unformatted text preview: Physics 1D03 Sununer2009 TEST 1 May 25, 2009 Instructor: Dr. A. J opko Name: S W Duration: 80 minutes ' Student Number: Signature : Instructions: 0 Print your name and student number in the spaces above and then sign your name. In Part A, circle the letter beside the answer of your choice. In Part B, provide complete solutions in the space below each question. Do not use pencils. You may use the formula page provided but no other notes or text. Only the McMaster standard calculator is allowed. There are 9 multiple-choice questions in part A and 4 long-answer questions in part B. Page 2 of 8 PART A Circle the letter beside the correct answer for each question. Each correct answer is worth 2 marks. An incorrect answer or unanswered question is worth zero marks. 1) A person holds a book in their hand by exerting an upward force on the book. Let this be the action force. The reaction force is: A) The downward force of gravity on the book. B) The upward force of gravity of the book on the earth. C) The dovmward force of the book on the floor. The downward force of the book on the hand. 2) Suppose you are standing inside a moving bus. Suddenly the driver of the bus brakes to avoid an accident. You will be propelled forward because: A) The bus exerts a forward force on you. 13) The normal force of the bus on you has a forward component. © Your inertia wants to remain the same. D) You exert a backward force on the bus. 3) A particle moves at a constant speed v=4.0 mfs for 3.0 seconds and then remains at rest for another 2.0 seconds. Over the 5.0 seconds, the particle’s average speed, in mfs, is: A)4 ® 2.4 C) 2 D) 0.8 Continued next page Page 3 of 8 4) The velocity Vector of a boat relative to the water is given by (4, -2) mfs while the velocity of the boat relative to the ground is given by (3, 3) m/s. Then the velocity of the water relative to the ground, in m/ S, is given by: B) (1, -5) C) (5, -7) D) (—5, 7) 5) The driver of a speeding truck slams on the brakes and skids to a stop in a distance d meters. If the mass of the truck were doubled then the distance the truck skids would be: ® d B) More than d. C) Less than d. D) Impossible to determine with the information given. 6) A wheel rotates counterclockwise in the x—y plane when viewed from the positive 2 axis. If the wheel starts to slow down then: A) The angular velocity vector points in the positive 2 direction while the angular acceleration vector points in the positive 2 direction. i B) The angular velocity vector points in the positive 2 direction while the angular aCCeleration vector points in the negative 2 direction. C) The angular velocity vector points in the negative 2 direction while the angular acceleration vector points in the positive 2 direction. D) The angular velocity vector points in the negative 2 direction while the angular acceleration vector points in the negative 2 direction. Continued next page Page 4 of 8 7) Fictitious forces arise in a reference frame because the frame is: A) Moving with constant velocity. .Not an inertial reference frame. C) At rest. D) All of the above. 8) An object, released from rest at 1:0, falls under gravity a distance d in a time of t seconds. If it continues to fall for a further time of t seconds (for a total time of 2t) then the total distance it has fallen since it was released is: A) d B) 2d C) 3d [email protected] 4d 9) An applied external force creates a torque on an object with respect to a given point. If the force vector is moved to another point on the same line of action then the torque: A) Will increase. .Stays the same. C) Will decrease. D) Depends on which way the force vector is moved along the line of action. Continued next page Page 5 of 8 PART B Write a clear solution showing how the answer is obtained. Each problem correctly answered is worth 3 marks. 10) A 120.0 kg Chesterfield is pushed up a frictionless ramp at a constant acceleration of 1.5 m/s2 by a delivery person. a) If the ramp is inclined at 9:30.00 to the horizontal, what horizontal force F must the delivery person apply to the Chesterfield? (Draw an appropriate free-body diagram and suitable axes) +1, U030“ 'LW3,M%O F : WM" (9 (887.8628) [k b) If the ramp is 10.0 meters long and the Chesterfield starts from rest at the bottom of the ramp, find the speed of the Chesterfield at the top of the ramp. V: (BL 61 (10) = 30 Continued next page Page 6 of 8 11) A 1.5 kg block is at rest on a horizontal floor. The coefficients of static and kinetic friction between the block and the floor are both 0.33. You pull on the block with a force F= 4 newtons at an angle of 20° above the horizontal. Draw a free-body diagram for the block. a) Find the force of friction of the floor on the block? F=4N b) Does the block accelerate or remain at rest? Explain. Continued next page Page 7 of 8 1-2) A 0.40 kg object is swung in a vertical circular path by a string of length 0.80 In. a) If the object’s speed is 8.5 mfs at the top of the path, what is its centripetal acceleration there? L 001'”: :l $13) K o 7?? LqOWg @ b) What is the tension in the string? c) What is the tangential acceleration of the object there? GEE—JO Continued next page Page 8 of 8 13) A mass, attached to a 50.0 cm long string, starts with an initial angular velocity of 0.50 revls and undergoes a constant angular acceleration around a circular path for 30 revolutions in a time of 25.0 s. a) Determine the angular acceleration of the mass, in rev/32. @Cgfimwjdz gal Dem-+3 <>< (”3 0L -,—_ 0.0Sb/ULW/glfi b) Determine the final angular velocity of the mass, in rev/s. (Ale 3 wo+°L—b ,3 0/1}— omS‘é; (SLY) END ...
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