VIEWS: 3 PAGES: 6 POSTED ON: 3/30/2012
PLEASE SHOW ALL WORK FOR 1ST PROBLEMS 1-8 1. (TCO 1) This question requires a numeric or algebraic answer. In order to receive full credit for this problem, you must show all your work. To show your work for this problem, you may scan neatly handwritten work or type up your work in MS Word using the equation editor. A pinecone falls straight down from a pine tree growing on a 20 degree slope. The pinecone hits the ground with a speed of 10 m/s. What are the components of the pinecone’s impact velocity parallel and perpendicular to the ground? 0 1458474024 Essay 1 2. (TCO 2) A rock is thrown from a bridge at an angle of 30 below horizontal. Immediately after the rock is released, is the magnitude of the acceleration greater than, less than, or equal to g? At the instant of impact, is the rock’s speed greater than, less than, or equal to the speed at which it was thrown? Explain in complete sentences. 0 1458474025 Essay 5 3. (TCO 3) A mosquito collides head-on with a car traveling at 60 mph. Is the force of the mosquito on the car larger than, smaller than, or equal to the force of the car on the mosquito? Is the magnitude of the acceleration of the mosquito larger than, smaller than, or equal to the magnitude of the car's acceleration? Explain in complete sentences. 0 1458474026 Essay 9 4. (TCO 4) Ramon and Sally are observing a toy car speed up as it goes around a circular track. Ramon says, “The car is speeding up, so there must be a net force parallel to the track.” “I don’t think so,” replies Sally. “It’s moving in a circle and that requires a centripetal acceleration. The net force has to point towards the center of the circle.” Do you agree with Ramon, Sally, or neither? Explain in complete sentences. 0 1458474027 Essay 10 5. (TCO 5) This question requires a numeric or algebraic answer. In order to receive full credit for this problem, you must show all your work. To show your work for this problem, you may scan neatly handwritten work or type up your work in MS Word using the equation editor and submit it using the Final Exam Dropbox. You should make your submissions after you complete the exam. How much work does an elevator motor do to lift a 1000 kg elevator a height of 10 m? How much power must the motor supply to do this in 50 s? 0 1458474028 Essay 15 6. (TCO 6) A 0.2 kg plastic cart and a 20 kg lead cart both roll without friction on a horizontal surface. Equal forces are used to push both carts forward for a time of 1 s, starting from rest. Is the momentum of the plastic cart greater than, less than, or equal to the momentum of the lead cart? Explain in complete sentences. 0 1458474029 Essay 17 7. (TCO 7) This question requires a numeric or algebraic answer. In order to receive full credit for this problem, you must show all your work. To show your work for this problem, you may scan neatly handwritten work or type up your work in MS Word using the equation editor and submit it using the Final Exam Dropbox. You should make your submissions after you complete the exam. How fast, in rpm, would a 100 g, 50-cm diameter beach ball have to spin to have an angular momentum 2 of 0.10 kg m /s? 0 1458474031 Essay 21 8. (TCO 8,9) This question requires a numeric or algebraic answer. In order to receive full credit for this problem, you must show all your work. To show your work for this problem, you may scan neatly handwritten work or type up your work in MS Word using the equation editor and submit it using the Final Exam Dropbox. You should make your submissions after you complete the exam. You need to determine the density of a ceramic statue. If you suspend the statue from a spring scale, the scale reads 28.4 N. If you then completely submerge the statue in a tub of water, the scale reads 17.0 N. What is the statue’s density? Multiple choice 1. (TCO 1) You walk 53 m to the north, turn 60° to your right, and then walk another 45 m. Determine the direction of your displacement vector. Express your answer as an angle relative to east. 50° N of E 57° N of E 63° N of E 69° N of E 0 1458474013 MultipleChoice 1 2. (TCO 2) A skier begins skiing straight down a hill having a constant slope, starting from rest. If friction is negligible, as the skier goes down the hill, his or her ______. acceleration is zero acceleration increases with time acceleration is constant, with a value of roughly 10 m/s/s acceleration is constant, with a value less than 10 m/s/s 0 1458474014 MultipleChoice 7 3. (TCO 3) A 1.75 kg book is sitting on a stationary table. What is the magnitude and direction of the force exerted on the book by the table? 18.6 N, up 18.6 N, down 17.2 N, up 17.2 N, down 0 1458474016 MultipleChoice 11 4. (TCO 4) You need to make a sharp turn on a flat road, making a radius of curvature of 15 meters. How does the required force of static friction between your tires compare if you make the turn at 30 mph vs. 60 mph? The force of friction needs to be four times as large. The force of friction needs to be twice as large. The force of friction is the same for both speeds since the radius of curvature is the same. None of the above choices are correct. 0 1458474017 MultipleChoice 15 5. (TCO 5) A 1000.0 kg car is moving at 15 km/h. If a 2000.0 kg truck has 18 times the kinetic energy of the car, how fast is the truck moving? 36 km/h 45 km/h 54 km/h 63 km/h 0 1458474018 MultipleChoice 16 6. (TCO 6) Three cars, car X, car Y, and car Z, begin accelerating from rest, at the same time. Car X is more massive than car Y, which is more massive than car Z. The net force exerted on each car is identical. After 10 seconds, which car has the most momentum? They all have the same momentum. Car X Car Y Car Z 0 1458474019 MultipleChoice 20 7. (TCO 7) A 95 N force exerted at the end of a 0.50 m long torque wrench, gives rise to a torque of 15 N•m. What is the angle (assumed to be less than 90°) between the wrench handle and the direction of the applied force? 14 18 22 25 0 1458474021 MultipleChoice 24 8. (TCO 8) An air bubble underwater has the same pressure as that of the water. As the air bubble rises towards the surface (and its temperature remains constant), the volume of the air bubble ______. increases decreases remains constant increases or decreases depending on the rate at which it rises