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Unformatted text preview: Phys 111 Fall 2007 General Physics I: Final Exam 10 December 2007 Name: Total: /100 Instructions There are 13 questions on 12 pages. Show your reasoning and calculations and always justify your answers. Physical constants and useful formulae g = 9 . 81m/s Moment of inertia: solid disk I = 1 2 mr 2 Moment of inertia: hoop I = mr 2 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 1L = 1 10 3 m 3 T C = T + 273 . 15 T F = 9 5 T C + 32 water = 1 . 10 3 kg/m 3 This page is intentionally blank. 2 Question 1 A skydiver of mass 100kg reaches a constant velocity of 50m/s straight down while falling through the air and before opening his parachute. Consider the motion of the skydiver only during the period in which he falls with constant velocity and not during the period prior to attaining constant velocity. a) Determine the acceleration of the skydiver during the period in which he falls with constant velocity . b) Determine the net force exerted on the skydiver during the period in which he falls with constant velocity . c) Determine the force exerted by the air on the skydiver during the period in which he falls with constant velocity . /8 3 Question 2 A person pushes down on a block of mass m at an angle of 30 above the horizontal. The block moves along a horizontal frictionless surface as illustrated. Which one of the following is true regarding the mag nitude of the normal force, N , exerted by the surface on the block? a) N = mg. b) N is larger than mg. c) N is smaller than mg. 100N 30 /5 Question 3 Two ice skaters, Alice and Bob, are initially at rest on a frictionless horizontal ice sheet....
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 Spring '11
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