# * * MATHEMATICS (MEI) 4764 Mechanics 4 ADVANCED GCE. Tuesday 15 June 2010 Morning. Duration: 1 hour 30 minutes. Turn over

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2 2 Section A (24 marks) 1 At time t a rocket has mass m and is moving vertically upwards with velocity v. The propulsion system ejects matter at a constant speed u relative to the rocket. The only additional force acting on the rocket is its weight. (i) Derive the differential equation m dv dt + udm = mg. [4] dt The rocket has initial mass m 0 of which 75% is fuel. It is launched from rest. Matter is ejected at a constant mass rate k. (ii) Assuming that the acceleration due to gravity is constant, find the speed of the rocket at the instant when all the fuel is burnt. [8] 2 A particle of mass m kg moves horizontally in a straight line with speed v m s 1 at time t s. The total resistance force on the particle is of magnitude mkv 3 2 N where k is a positive constant. There are no other horizontal forces present. Initially v = 25 and the particle is at a point O. (i) Show that v = 4(kt ) 2. [7] (ii) Find the displacement from O of the particle at time t. [3] (iii) Describe the motion of the particle as t increases. [2] Section B (48 marks) 3 A uniform rod AB of mass m and length 4a is hinged at a fixed point C, where AC = a, and can rotate freely in a vertical plane. A light elastic string of natural length 2a and modulus λ is attached at one end to B and at the other end to a small light ring which slides on a fixed smooth horizontal rail which is in the same vertical plane as the rod. The rail is a vertical distance 2a above C. The string is always vertical. This system is shown in Fig. 3 with the rod inclined at θ to the horizontal. A a 2a C 3a Fig. 3 B (i) Find an expression for V, the potential energy of the system relative to C, and show that dv dθ = a cos θ(9 2λ sin θ mg). [6] (ii) Determine the positions of equilibrium and the nature of their stability in the cases (A) λ > 2 9 mg, (B) λ < 2 9 mg, (C) λ = 2 9 mg. [10] [4] [4] OCR Jun10

5 GCE Mathematics Advanced GCE 4764 Mechanics 4 Mark Scheme for June 2010 Oxford Cambridge and RSA Examinations

6 OCR (Oxford Cambridge and RSA) is a leading UK awarding body, providing a wide range of qualifications to meet the needs of pupils of all ages and abilities. OCR qualifications include AS/A Levels, Diplomas, GCSEs, OCR Nationals, Functional Skills, Key Skills, Entry Level qualifications, NVQs and vocational qualifications in areas such as IT, business, languages, teaching/training, administration and secretarial skills. It is also responsible for developing new specifications to meet national requirements and the needs of students and teachers. OCR is a not-for-profit organisation; any surplus made is invested back into the establishment to help towards the development of qualifications and support which keep pace with the changing needs of today s society. This mark scheme is published as an aid to teachers and students, to indicate the requirements of the examination. It shows the basis on which marks were awarded by Examiners. It does not indicate the details of the discussions which took place at an Examiners meeting before marking commenced. All Examiners are instructed that alternative correct answers and unexpected approaches in candidates scripts must be given marks that fairly reflect the relevant knowledge and skills demonstrated. Mark schemes should be read in conjunction with the published question papers and the Report on the Examination. OCR will not enter into any discussion or correspondence in connection with this mark scheme. OCR 2010 Any enquiries about publications should be addressed to: OCR Publications PO Box 5050 Annesley NOTTINGHAM NG15 0DL Telephone: Facsimile:

7 4764 Mark Scheme June (i) Impulse = change in momentum Accept sign errors in Form DE E1 Complete argument (including signs) 4 (ii) So Integrate Use condition Fuel burnt when 8 1

8 4764 Mark Scheme June (i) N2L Separate and integrate Use condition Rearrange E1 7 (ii) Integrate Use condition 3 (iii) The speed decreases, tending to zero B1 The displacement tends to B1 Cv (10/k) 2 2

9 4764 Mark Scheme June (i) GPE term EPE term Differentiate E1 6 (ii) Solve (A) and Second derivative (or other valid method) Any correct form Substitute unstable Deduce unstable Substitute other value 3

10 4764 Mark Scheme June 2010 Consider second derivative stable Complete argument 10 (B) Consider solutions only Consider second derivative stable Complete argument 4 (C) gives only (from both factors) Consider solutions Valid method Hence stable Complete argument 4 4

11 4764 Mark Scheme June (i) Mass of slice So So ft E1 8 (ii) Mass of small cone Mass of frustum B1 Moment of inertia of small cone E1 4 5

12 4764 Mark Scheme June 2010 (iii) 4 (iv) Centre of mass: OG Any distance which locates G i.e. G is face m from the small circular 3 (v) Moment of impulse = ang. momentum Radius at G is B1 Moment of impulse = ang. momentum 5 6

13 OCR (Oxford Cambridge and RSA Examinations) 1 Hills Road Cambridge CB1 2EU OCR Customer Contact Centre Qualifications (General) Telephone: Facsimile: For staff training purposes and as part of our quality assurance programme your call may be recorded or monitored Oxford Cambridge and RSA Examinations is a Company Limited by Guarantee Registered in England Registered Office; 1 Hills Road, Cambridge, CB1 2EU Registered Company Number: OCR is an exempt Charity OCR (Oxford Cambridge and RSA Examinations) Head office Telephone: Facsimile: OCR 2010

14 Reports on the Units taken in June Mechanics 4 General comments The standard of work seen was, in general, very high. Many candidates found the work on equilibrium difficult. Comments on individual questions 1) (Variable mass Rockets) 1) (i) Generally well answered, though the majority of candidates failed to account properly for the signs of theirδm or δ m terms. 1) (ii) The technique of separating variables and integrating was well understood and executed by most candidates, though a common error in some candidates was to treat m as a constant. 2) (Variable force) 2) (i) Again, the process of separation of variables was well understood. This was well answered, with only small errors in signs or manipulation. 2) (ii) Most candidates knew that they had to replace v with d dx t were mostly in signs and manipulation as in part (i). and integrate again. Errors 2) (iii) Candidates who had answered parts (i) and (ii) usually gave good answers here, though many discussed only the velocity or displacement. The mark for the velocity required candidates to state that the velocity of the particle was tending to zero, not just slowing down. 3) (Equilibrium) 3) (i) This was almost universally done correctly. Some candidates found the GPE relative to the horizontal rail, which gave the correct value for V, but not for V. 34

15 Reports on the Units taken in June ) (ii) This question caused many candidates problems. Though almost all knew how to find the positions of equilibrium and their nature, they were not able to follow through the 1 2mg process, particularly with regards to the position where θ = sin. (A) The first part was usually well answered by most candidates, with both values of θ found and the correct expression for the second derivative. Some candidates included extra values for θ. Most candidates knew that they had to find the sign of the second derivative for their value of θ. In general the work for θ = π/2 was good, but many 1 2mg struggled to make any progress with θ = sin, often because they did not rewrite 9λ their expression for V`` in terms of sinθ. (B) Almost all candidates that got this far through the question realised that the condition resulted in only one position of equilibrium and then successfully determined the nature of that position. (C) Again many candidates found that only one position of equilibrium existed and that V = 0 at that point. However, very few realised that this resulted in an ambiguity that could be resolved; most labelled this position as a point of inflection and were unsure how to proceed. 4) (Rotation - Moments of inertia and dynamics of a rotating body) 4) (i) This part was not well answered in general. Many candidates used an expression of the form ρπr 2 δr and those that gave the correct expression for δm in terms of y and 2 δ x often failed to change variables accurately, or used I slice = Mx. As a result, most candidates did not get the required expression for the moment of inertia of the cone; many then attempted to reverse engineer an extra constant multiple rather than find their error. Some candidates added unnecessary work by deriving the mass of the cone from first principles instead of using the formula provided. 4) (ii) This part was usually done correctly. Many candidates did far more work than was necessary by finding the density of the cone and the volumes of each solid to find their masses instead of using proportionality. 4) (iii) Almost universally correct. 4) (iv) The concept was often well understood, but many of the candidates did not find the centres of mass of the cones relative to the same point 4) (v) This part was not answered well, or at all, by many candidates. The essential concept that moment of impulse is equal to the change in angular momentum was often quoted, but not used correctly λ 35

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