5 v NICH a. Distance O Re R d. displacement b. Velocity e. none of the above c. acceleration 2 Study the position-time graph pictured below and select the statement that is true. J Position vs. Time a. The object accelerates, stops, then accelerates in the opposite direction. b. The object's speed is greatest during the first segment. . The object's acceleration is greatest during the last segment. d. The object's average velocity is zero. e. The object travels a greater distance in the first segment than in the last segment. 3. A taxi cab drives 30.0 kimv/h [W] then turns and drives 31.0 kin/h [N]. The entire change in velocity takes 10 s. What is the taxi's average acceleration? a. 431 kmy/h? [N44W) d. 1.20 m/s [E46 N b, 4.31 knyh? [E46 N| e. None of the above. c. 1.20 m/s [N44W) 4. The action and reaction forces of Newton's third law a. act on the same object b. act as a pair of forces that are "balanced" c. make the net force zero because they are equal in strength and opposite in direction d. act on two different objects e. cancel each other out like F, and Fx 5, If you weighed 112 N on the Moon where g = 1.6 N/kg, how much would you weigh on Earth? a L1xI10*N d LI1xI10N b. 1.7x10*N e 69xI10N c. 69x10N 0. A student exerts a force of 12 N to compress a spring 2.54 cm. The force constant for the spring is a 0.30 N/m d. 31 N/m b. 4.7 N/m e. 4.7 x 10 N/m 15 N/m 1 e =R f m i B Fr ey stepped on by a boxer. The A spring with a force constant of 2.1 % 107 N/m compresses 3.5 cm when mass of the boxer is 65 kg d. 82 kg Tikg E. 740 kg 75kg The coefficient of friction stems from the nature of the two surfaces in contact d. strength of the normal force mass of the object e. strength of the gravitational force strength of the applied force The specific heat capacity of iron is 4.5 % 10 J/kg-C. The heat energy required to heat 5.0 kg of iron from 10C to 40C is 9.0x10) d 22%100] 6.8 x 101 e T75x10'] 3.0x10"] The amount of work done to stop a bullet travelling through a tree trunk a distance of 50.0 cm with a force of 2.00 % 10 N is 4.00x 1071 d 1.50x10] 2.50x 10] e 1L.00x10] 1.00 x 10) A 5.00-kg sack of potatoes is raised to a height of 2.00 m and then thrown at a constant velocity of 2.00 my/s onto a truck. What is the kinetic energy of the potatoes? 5.001 d. 1031 g98.01] e. 1081 10.0] A liquid is being heated on a hotplate. The transfer of heat in the liquid through a circular path is called radiation d. conduction convection . heat exchange heat transfer A 40.0-kg girl rides her 0.50-kg skateboard. She starts from rest and at a constant acceleration reaches 3.0 m/s in 10 5 on a horizontal surface. How much power did she use? 6.1x10'W d 13x10W 1.2 %100 W e 18x10'W 6.1 x 10W An elevator motor lifis a load of 2500 kg a height of 12.0 m in 10.00 seconds. The energy required by the motor to accomplish this task is 2 000 000 J. What is the efficiency of the elevator? 10.0% d. 102% 98.0% e. 294% 14.7% An object completes 240 cycles in 15 s. What is its frequency, in hertz? 16 Hz d. 15Hz 0.063 Hz e 240 Hz Page 3 [ 9 a 29. The position-time graph shown at right represents the motions of d two objects, A and B. Which of the following statements concerning the objects' motions is true? [A] Object B travels the greater distance. [B] Object B has the greater speed. [C] Both objects have the same position at the point where the lines cross. [D] Object A is travelling for a longer time. [E] Object A leaves the reference point at an earlier time. t 0w 30. Consider the velocity-ime graph at right and select the statement that is true. v [A] At no time can the motion be considered \"uniform. [B] The object returns to its onginal position. [C] The object is accelerating throughout the entire recorded time. [D] The object travels in one direction and then the other. [E] The object speeds up and later slows down. t Show all work! Answer questions in the space provided. For each numerical question, one communication mark will be allotted for significant digits and units. 1. Standing waves are produced in a long string. The waves are travelling at 125 cm/s and the distance between the first and fifth nodes is 80.0 cm a. Draw a labelled diagram depicting this standing wave. /1A b. Find the wavelength of the waves. /lc 2A Give the answer in the correct number of significant digits and units: c. Find the frequen Page 6 / 9 S /1c 12A - RO - K /20 A /18 /18 4 /15 2. A piece of lead at 160C is submerged in 1.2 Kg of water at 15C and cooled to 21C. Determine the mass of the piece of lead. 3A /e Thinking Give the answer in the correct number of significant digits and units: 3. A commercial hot-air balloon maintains a level altitude, letting the passengers take in the spectacular view of scenic Brampton before changing altitude. The thrusters exert 5250 N of upward force on the balloon. If the mass of the hot air balloon and its passengers is 325 kg and the magnitude of frictional air resistance is 422 N, determine the magnitude and direction of the balloon's acceleration. Include a complete free-body diagram in yvour solution. /1c /4T Give the answer in the correct number of significant digits and units: 4. A cart (at rest) with a mass of 100.0 kg rolls down a frictionless roller coaster. a. Calculate the kinetic energy of the cart at point B. /lc /3T Give the answer in the correct number of significant digits and units: b. Calculate the speed of the cart at point B. Page 7 [ 9 5. The circuit contains 3 resistors (R1, R2 circuit has two pathways: one path contains R: and Re, the other path contains R1 and Ra. Rzisin pa:aei with Rs; R1 is in series with the power source. a) What is the total resistance of the circuit if B1 = 20 0, Rz=100and Ra = 15 (1. 3T /1c b) Calculate Vz if Vs is 120 V. /3T /1c B. A jogger runs 6.0 km [E], then 4.0 km [N], and finally 2.0 km [W]. The entire trip takes 2.0 h to complete. a) Draw a scale diagram and determine the jogger's total displacement. /3T /1c Communication 1. Why do transformers only work with Alternating Current? 3C 2. Explain the concept of specific heat and how thermal energy calculation are affected by phase change of materials