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- 2. A 5.0-kg puppy running at 2.0 m/s picks up a 1.0-kg stick that is sitting on the ground. What is the momentum of the puppy and the stick after the puppy picks up the stick? Conceptual Physics Reading and Study Workbook UTwo particles with different initial momentum collide and stick to each other. Compared to before the collision, the system of two objects after the collision has? Explain. A. Less total momentum and less kinetic energy B. Less total momentum but the same amount of total kinetic energy. C. Not enough information is given to decide. D. The same amount of total momentum and the same total kinetic energy. E. The same amount of total momentum, but less total kinetic energy.movement. 12. A small car meshes with a large truck in a head-on collision. Which of the following statements concerning the momentum during the collision are correct? * a. The momentum of the car-truck system is conserved, but the momentum of each one separately is not conserved. b. The momentum of the truck is conserved. c. The momentum of the truck and the car are each conserved. O d. The momentum of the car is conserved. O e. The car and truck must undergo the same change in speed. hp 7. 8
- A brick stands on the ground vertically, as shown. A ball made of clay with mass m is thrown with velocity v at the brick and sticks to it. Another ball made of aluminum but with the same mass m is also thrown with the same velocity v at the brick but instead bounces off of it. Which ball is more likely to knock the brick over? a. Not enough information. b. the clay ball c. the aluminum ball d. Both balls are equally likely to knock over the brick.A 7400 kg truck traveling along a straight road at 14 m/s comes to a stop and remains stationary for several minutes. It then accelerates backward in reverse until it reaches 5.0 m/s in the opposite direction. What is the magnitude of the change in momentum of the truck for this entire process? A. 100,000 kg. m/s B. 140,000 kg. m/s C. 67,000 kgm/s D. 37,000 kgm/s O C O B OD O AD-E thank you!
- Questions 1.-4. refer to a head-on collision between two balls with the following initial values: Before Collision m2 V Ix 3.5 kg 4.5 kg 5.0 m/s -2.0 m/s 1. What is the total momentum (in kg m/s) of the system? 2. If the two balls stick together, what is their common speed (in m/s) after they collide? 3. How much kinetic energy (in joules, positive number) was lost in this collision? 4. If the two balls do not stick together, and the first ball moves at vịx = -1 m/s after they collide, what is the speed (in m/s) of the second ball?0₁ 5. Student A cadet's life was saved in an automobile accident because an airbag expanded to stop the motion of his head. If the airbag had not deployed, the windshield would have stopped the motion of his head in a much shorter time. Compared to the windshield, the airbag: caused a much smaller change in momentum of the cadet's head. b. exerted a much smaller impulse on the cadet's head. caused a much smaller change in kinetic energy of the cadet's head. d. exerted a much smaller force on the cadet's head. did much more work on the cadet's head. a. 0. e biect is equal to:5. *A ball of mass 6.5 kg moving with a speed of 15 m/s to the right collides head-on with a 3.5 kg ball which is at rest. If the collision is elastic, what is the speed and direction of each ball after the collision?