Motion of Object - Physics - Past Paper, Exams of Physics

Download Motion of Object - Physics - Past Paper and more Exams Physics in PDF only on Docsity! Physics 21 Final Exam Fall 2012 1 Physics 21 Fall 2012 Final Exam (5 pages) Name:_______________________ December 10 , 2012 Total Score:_______/120 Remove this page from your exam when you begin. Write clearly in the space provided on this Answer Sheet the letter which you believe to be the best answer to each question found on the following pages. Only answers on this page will be graded. Each question is worth 5 points. 1)_____ 9)_____ 17)_____ 2)_____ 10)_____ 18)_____ 3)_____ 11)_____ 19)_____ 4)_____ 12)_____ 20)_____ 5)_____ 13)_____ 21)_____ 6)_____ 14)_____ 22)_____ 7)_____ 15)_____ 23)_____ 8)_____ 16)_____ 24)_____ Physics 21 Final Exam Fall 2012 2 1. An object is dropped from rest from the top of a a tower. The x-axis is directed vertically upwards. The vx-t graph of its motion is given by which plot letter in the graph at the right? A) A B) B C) C D) D 2. The motion of an object is described by the x-t-diagram at the right. The x- axis is pointing to the right. Which of the following is false? A) The object moves to the left at C. B) The object has its largest speed at B. C) The object moves faster at E than at B. D) The object is at rest at F. 3. A ball is launched from the ground with at an angle of  above the horizontal. The ball is in the air for a time T until it hits the ground a horizontal distance D away. The initial speed of the ball is A) D/T B) (D cos θ)/T C) D/(T cos θ) D) D/(T sinθ) 4. If V0 is the initial speed of the ball in problem 3, the ball reaches its maximum height at time A) V0 2 /2g B) (V0sin) 2 /2g C) V0sin /g D) V0/g 5. A crate of mass M is on a frictionless horizontal surface and is attached to one end of a rope. The rope passes over a frictionless pulley and a crate of mass M hangs from the other end. The rope is taut. The system is released from rest. The acceleration is A) less than g B) equal to g C) larger than g D) zero 6. A monkey is climbing up a fixed rope at constant speed. The reaction force to the monkey’s weight force is A) the force by the rope on the monkey B) the force of gravity by the monkey on Earth. C) the force by the monkey on the rope D) no reaction force, because the speed is constant. M M A D B C t vx