Third Law Reaction - General Physics - Past Paper, Exams of Physics

Download Third Law Reaction - General Physics - Past Paper and more Exams Physics in PDF only on Docsity! St. Vincent College PH 111: General Physics I Exam 2 9/28/2007 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. Problem 1 20 Problem 2 20 Problem 3 30 Problem 4 30 Total 100 1. (20 pts) a) (5 pts) You stand on a scale while riding an elevator. When the elevator begins accelerating upwards, the reading on the scale increases. Does this mean that your weight (the gravitational force that the earth exerts on you) has actually increased? Explain. b) (5 pts) In the situation of part (a) above, what is the “3rd Law Reaction” to the earth exerting a downward gravitational force on your body? c) (5 pts) While camping you drive some tent spikes with a sledge-hammer. Compare the relative magnitudes of the force exerted on the spike by the hammer and the force exerted on the hammer by the spike. d) (5 pts) The International Space Station orbits the Earth in a more-or-less circular trajectory. The astronauts inside (who also follow the same more-or-less circular trajectory) appear weightless. Is this because there is no gravitational force acting on them? Explain.