2007midterm2

# 2007midterm2 - Phys 111 Fall 2007 General Physics I Class Exam 2 16 November 2007 Name Total/50 Instructions There are 7 questions on 5 pages Show

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Fall 2007 General Physics I: Class Exam 2 16 November 2007 Name: Total: /50 Instructions There are 7 questions on 5 pages. Show your reasoning and calculations and always justify your answers. Physical constants and useful formulae g = 9 . 81m/s R = 8 . 314J/mol K N A = 6 . 02 × 10 23 /mol k B = 1 . 38 × 10 23 J/K P atmos = 1 . 01 × 10 5 Pa T C = T +273 . 15 T F = 9 5 T C +32 Moment of inertia: solid disk I = 1 2 mr 2 Moment of inertia: hoop I = mr 2 ρ water = 1 . 0 × 10 3 kg/m 3 Question 1 A ball attached to a string initially swings in a hor- izontal circle with a constant angular speed. The string is adjusted in such a way that the ball swings with a faster constant angular speed without chang- ing the tension in string. Which of the following must be true? a) The length of the string was not changed. b) The string was shortened. c) The string was lengthened. d) It is impossible to get the ball to swing at a faster angular speed without changing the

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## This note was uploaded on 06/21/2011 for the course MATHEMATIC 135 taught by Professor Phystago during the Spring '11 term at Waterloo.

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2007midterm2 - Phys 111 Fall 2007 General Physics I Class Exam 2 16 November 2007 Name Total/50 Instructions There are 7 questions on 5 pages Show

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