Exam 2 with Solution - General Physics 1 | PHYS 111, Exams of Physics

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Phys 111 Fall 2006 General Physics I : Class Exam 2 10 November 2006 Name: Solu an Total: /50 Instructions e There are 7 questions on 6 pages. ¢ Show your reasoning and calculations and always motivate your answers. Physical constants =981m/s* R=8.314J/molK Na =6.02 x 10-3 /mol kp = 1.38 x 107 J/K Patmos = 1.01 x 10° Pa 2 2 1 : Moment of inertia: solid disk J = ym Moment of inertia: hoop I = mr To = T — 273.15 Tp = pTo +32 Question 1 Alice and Bob each swing a yo-yo around in a circle in the horizontal plane. The yo-yos have the same mass, 0.10kg, and each rotates at a constant speed of 2m/s. The string on Alice’s yo-yo is 0.25m long while that on Bob’s yo-yo is 0.5m long. If each holds the end of their yo-yo’s string, which of the following is true regarding the forces on the yo-yo strings? (Choose one) a) The force that Alice exerts is the same as that which Bob exerts. b) The force that Alice exerts is half that which Bob exerts. c) The force that Alice exerts is one quarter that which Bob exerts. (HJrhe force that Alice exerts is double that which Bob exerts. Fama = v= —— /4 6 = Adbeemes de tie 2 3 t bob Folia 2 Feb.