Question 1 A bobsleigh and its riders have a combined mass of 598 kg. They cross the finish line with a velocity of 125 km/h [forward]. The momentum of the team and the bobsleigh at the finish line is a) 2,08 x 104 kg-m/s [forward] O b) 7.48 x 104 kg.m/s [forward] O c) 2,69 x 105 kg-m/s [forward] O d) 4.78 kg-m/s [forward] Oe) 17.2 kg-m/s [forward]Question 2 A wad of chewed bubble gum is moving with 1 unit of momentum when it collides with a heavy box that is initially at rest. The gum sticks to the box and both are set in motion with a combined momentum that is O a) less than 1 unit ( b) more than 1 unit O c) not enough information O d) 1 unitQuestion 3 Which of the following is not a unit of energy? O al kg.m/s' O b) J O c) W.s O d) kg. m' 18 Oe) N.mQuestion 4 In the picture of a roller coaster track shown below, the point where the roller coaster car would be travelling the fastest, uncler negligible friction is 031;; Oblg OCH; 0an 09h; Question 5 The gravitational potential energy of a 3.4-g grasshopper 14 mm above the ground is a) 4.7 x 10-4 J O b) 0.47 J O c) 4.7 * 102 J O d) 47 x 10-2 J O e) 4.7 )Question 6 A child pulls a 7.4-kg toboggan 4.2 m across level ground with a 15-N force that is 340 above the horizontal. The work done is O a) 35 J O b) 52 J O c) 63 J O d) 2.1 x 103] O e) 3.9 x 102 JQuestion 7 Forces of 2.4 N and 1.8 N act on an object at right angles to one another. What is the magnitude of a third force acting on the same object so that it remains stationary? O a) 9.0 N O b ) 4.2 N O c) 3.0 N O d) 2.7 N O e) 0.6 NQuestion 8 The free-body diagram of a wagon being pulled along a horizontal surface is best represented by E B C D A Fop Iapp FapF F. F. O a) A O b) B Occ O d) D O e) EQuestion 9 An object is pushed horizontally at a constant velocity. What can correctly be said about the forces acting on the object? O a) The force(s) acting forward is/are greater than the force(s) acting backward. ( b) The sum of all forces has a value directed forward. O c) The sum of all forces is zero. O d) The forces acting on the object can be said to be "unbalanced." (e) Newton's second law best summarizes the effect of the forces acting on the object.Question 10 An object sits at rest on a ramp. Which of the following free-body diagrams best represents the forces acting on the object? A B D F F. al A O b ) B Occ O d) D O elEQuestion 11 A plane must fly.r to a destination located due north from its departure point. A gentle wind is blowing from the south-west. What direction must the plane point to reach its destination? 0 a] north 0 b) north-west O C} north-east 0 d: west 0 9} east Question 12 For a javelin thrower to maximize her throwing distance, she should release the javelin at an angle O a) of 45 O b) of less than 45 O c) of greater than 450 O d) dependent on the javelin's speed upon release O e) dependent on the thrower's strengthQuestion 13 The slope of a velocity-time graph represents 0 a] displacement O b} average velocity 0 C} instantaneous velocity 0 '5\" acceleration O 3} distance Question 14 Ignoring air resistance, which of the following are exhibiting "free fall"? O a) an object, initially at rest, dropped out of a window b) an object thrown vertically downward from a window O c) an object projected vertically upward from a window ( d) an object thrown horizontally from a window O e) all of the aboveQuestion 15 A rock is tied to the end of a string and whirled around in a circle that describes a vertical plane. At which position is the tension in the string the least? 0 a] on the descending side of the circle 0 bl at the bottom cufthe circle 0 C} on the ascending side of the circle 0 di The tension in the string is the same at all places en the circle. 0 E} at the top of the circle Question 16 The diagram below shows a rock on the end of a string being whirled around in a circle in the horizontal plane. The motion is viewed from above and the stone is rotating clockwise. What are the directions associated with its instantaneous velocity and instantaneous acceleration, respectively? N S O 3] south, east 0 b} west, west 0 C} south, west 0 d} east, west 0 9} south, south Question 1? A student wishes to perform Young's double-sllt experiment to measure the wavelength of light of a given source. The student has measured the average distance between adjacent dark bands and the distance from the slits to the screen. What other measurement ls required to calculate the wavelength? 0 a) the distance between the source and the slits O bl the distance separating the two slits O C} the location of the central bright line 0 d} the angle between the central bright line and first nodal line 0 E} the distance between the centre of the two slits and any.r given dark band Question 18 A two-point source interference pattern is set up using blue light. What changes in the pattern would be observed if red light was used? O a) No changes are observed. b) The pattern disappears since red light has a very long wavelength. O c) The pattern has more nodal lines. O d) The pattern has fewer nodal lines. O e) none of the aboveQuestion 19 The electric field 0.50 m from a small sphere with a positive charge of 7.2 x 10- C is O a) 2.6 * 10# N/C [outward] O b) 2.9 * 10-4 N/C [outward] O c) 1.3 x 106 N/C [outward] O d) 2.6 x 106 N/C [inward] O el 2.9 x 10-4 N/C [inward]Question 20 If point charge -qwas absent, the electric field at point B would be E. What is the electric field between the two point charges,q and q, at point B which lies at the midpoint between the two charges? 0 *-Q O 31 2E [left] 0 b) 5 [left] 0 6} 2E [right] 0 d: o 0 e} 5 [right]