1. Two students push two identical shopping carts along a rough level surface at constant velocities and argue about who is doing more work. The first student pushes on a cart (with mass mi) over a distance d using a horizontal force F. The second student pushes a cart (also mass m) a distance 2d with the same size force F, but this force is directed at an angle of 60# below the horizontal. Which of the following is true? (A) Both students do the same amount of work on their respective carts. (B) The first student is doing twice as much work as the second (C) The second student is doing twice as much work as the first. (D) The second student is doing four times as much work as the first. 2. Students designed an experiment to determine how a force exerted on a system does work on that system as it moves through a displacement. In this case, the force is provided by the hanging mass my and the displacement is the vertical distance h indicated on the diagram. The mass of the string and the friction in the pulley are negligible, but there is a non-negligible force of friction between m and the table. Assume that the system does move when released, and that the speed upon hitting the floor is v. Which of the following is a correct relationship between the quantities involved in the experiment? (A) m,gh = -mv (B)mgh - Fh = -mu (Omgh - Fh = = (m + m juz (D)m,gh = = (m + m,ju- 3. A block is pushed against a massless spring, with & = 200 N/m, which is attached to a wall. The spring is compressed 0.04 m before the block is released. As the spring expands back to its original length, what will be the change in kinetic energy of the block? (A) 80J (B) 80.0 J (C) 4.0 ] (D) 0.16 J 4. A 0.5 kg pendulum bob is raised to 1.0 m above the floor, as shown in the image to the right. The bob is then released from rest. When the bob is 0.8 m above the floor, its speed is most nearly... (A) 5 m/'s (B) 4 m/s (C) 2 m/s 10 m D) Im's\fQuestion: 9 and 10 refer to two collision events where two different objects with equal mass are thrown toward a wall with the same initial speed wo. In Collision A, the rubber ball rebounds with no loss of speed. In Collision B, the lump of clay smacks into the wall and comes to rest. Collision A Va 9. In which collision is there a greater impulse exerted by the wall on the object? (A) Collision A (B) Collision B (C) The two are the same (D) Unable to determine 10. Assume that the time duration of each collision is equal. During which collision is there a larger average force exerted by the wall? (A) Collision A (B) Collision B (C) The two are the same (D) Unable to determine Collision B C