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CORK INSTITUTE OF TECHNOLOGY
INSTITIÚID TEICNEOLAÍOCHTA CHORCAÍ
Semester 2 Repeat Examinations 2009/
Module Code: MECH
School: Mechanical & Process Engineering
Programme Title: Bachelor of Engineering in Mechanical Engineering Bachelor of Engineering in Biomedical Engineering
Programme Code: EMECH_7_Y EBIME_7_Y
Module Title: Mechanics 1
External Examiner(s): Mr. A. Bateman and Dr. D. FitzPatrick Internal Examiner(s): Ms. M. Kavanagh, Mr. Michael Walsh
Instructions: Answer any 4 questions. Please tick off which questions you attempt on the front of the script.
Duration: 2 hours
Sitting: Autumn 2010
Requirements for this examination: Log Tables
Note to Candidates: Please check the Programme Title and the Module Title to ensure that you are attempting the correct examination. If in doubt please contact an Invigilator.
Q1 A force of 600N acting parallel to a plane inclined at 20º to the horizontal is required to move a mass of 50kg up the plane. Find (a) The coefficient of friction between the 2 surfaces. (15 marks) (b) The force parallel to the plane required to pull the mass down at a steady velocity. (10 marks) Include a sketch.
Assume static kinetic
Q2 A train has a constant acceleration of 1m/s^2.
Find a) The time taken for it to increase it’s velocity from 20km/hr to 50km/hr. (15 marks) b) The distance travelled during that time. (10 marks)
Q3 (a) Sketch and label a typical load v’s extension graph for mild steel.
(7 marks) (b) A pipe with outside diameter of 50mm and internal diameter of 45mm is subjected to a compressive load of 50kN. Find (i) The stress the pipe is subjected to. (6 marks) (ii) The strain the pipe is under if it’s original length is 100mm and it is compressed by 0.05mm. (6 marks) (iii) The Modulus of elasticity for the pipe material. (6 marks)
