Vertical Component of Acceleration - General Physics - Past Paper, Exams of Physics

Download Vertical Component of Acceleration - General Physics - Past Paper and more Exams Physics in PDF only on Docsity! St. Vincent College PH 111: General Physics I Exam 2 10/2/2009 The exam consists of 4 questions. The questions may not be worth the same number of points, so read the entire exam before beginning work. The more of your work that you show, the greater the likelihood of partial credit in the event your answer is incorrect. You must show some work to get any credit. Problem 1 25 Problem 2 20 Problem 3 30 Problem 4 25 Total 100 1. (25 pts) a) (5 pts) In Chapter 2, we assumed that the horizontal component of acceleration for an object in free fall was zero. Now, given Newton’s Laws, why is the horizontal component of this acceleration zero? b) (5 pts) A cannon ball is fired upward at a 58◦ angle. What is the vertical component of the accelera- tion of the ball when it reaches the highest point in its trajectory? c) (5 pts) The net force on an object is known to be zero. Must the object be at rest? d) (5 pts) You know that the net force on another object is zero, yet you observe that it is accelerating. Under what condition(s) could this occur? e) (5 pts) Give an example of a situation where the speed of an object does not change, yet the object is accelerating.