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1 Oxford Cambridge and RSA Wednesday 20 May 2015 Afternoon LEVEL 3 CERTIFICATE ENGINEERING H865/01 Mathematical Techniques and Applications for Engineers * * Candidates answer on the Question Paper. OCR supplied materials: None Other materials required: Scientific calculator Duration: 2 hours * H * INSTRUCTIONS TO CANDIDATES Write your name, centre number and candidate number in the boxes above. Please write clearly and in capital letters. Use black ink. HB pencil may be used for graphs and diagrams only. Answer all the questions in Section A and any three questions from Section B. Read each question carefully. Make sure you know what you have to do before starting your answer. Write your answer to each question in the space provided. Additional paper may be used if necessary but you must clearly show your candidate number, centre number and question number(s). Do not write in the bar codes. INFORMATION FOR CANDIDATES The number of marks is given in brackets [ ] at the end of each question or part question. The total number of marks for this paper is 60. This document consists of 16 pages. Any blank pages are indicated. A scientific calculator may be used for this paper [M/501/1904] DC (ST/SW) OCR is an exempt Charity Turn over
2 2 SECTION A Answer all questions. 1 Remove the brackets and simplify the expression 6x (8x + 5) [2] 2 Factorise the expression x 2 + 5x [2] 3 Simplify the expression [(x + 4)/8] (x 5)/ [2] 4 Solve the equation 6(3x 5) = 2(4x 7) [2] 5 (a) Convert π/3 radians to degrees.... [1] (b) Convert 120 to radians.... [1]
3 3 6 Name the wave form shown on the grid in Fig. 1 below... [1] y 1 0 2π 3π / 2 π π / 2 0 π / 2 π 3π / 2 2π x 1 Fig. 1 7 In the triangle ABC, angle A = 30 and the length of side a = 100 mm. Angle B is a right angle. Calculate angle C and the length of side c [2] 8 In a right angled triangle the cosine of angle x is 3/5. Draw the triangle and find the exact value of sine x [2] 9 Differentiate y = 3 cos x + 6x 3 with respect to x [2] Turn over
4 4 10 Differentiate y = sin x + (1/x) with respect to x [2] 11 Integrate 2 sin 5x with respect to x [2] 3 12 Calculate the value of the definite integral y 4x dx [3] 13 Explain, with the aid of a diagram, what is meant by the term skew in a distribution curve [2]
5 5 14 Determine the mode and the median point for the set of ungrouped data given: Mode =... [1] Median =... [1] 15 State the meaning of the parts of the following probability law listed: P(A or B) = P(A) + P(B) P(A and B) P(A).. [1] P(B).. [1] [Total: 30] Turn over
6 6 SECTION B Answer any three questions. 1 (a) Given that W = (mv 2 )/2. Calculate the value of W when m = 5 and v = [1] (b) Transpose the formula A = B(1 + 2CD) to make C the subject.... [3] (c) Transpose the formula v 2 = u 2 + 2as to make u the subject.... [2] (d) Given that A = B/(B + 2). Transpose the formula to make B the subject.... [4] [Total: 10]
7 7 2 (a) The area of a triangle is 1000 mm 2 and its base is 40 mm long. Calculate its perpendicular height.... [2] (b) The length of the sides of triangle XYZ are x = 8 m, y = 10 m and z = 12 m. Calculate the area of the triangle.... [5] (c) Calculate the area of a triangle ABC when angle B = 30, side a = 12 m and side c = 16 m.... [3] [Total: 10] Turn over
8 8 3 (a) A vehicle is moving in a straight line. The distance s metres moved in t seconds is given by s = 60(20e t/20 + t 20). Determine the acceleration of the vehicle after 10 seconds.... [4] (b) The surface area S of a particular cylindrical water tank is given by S = 2 πr /r where r is the radius. Calculate the radius of the tank that will give the minimum surface area.... [6] [Total: 10]
9 9 4 (a) The time taken, in minutes, to carry out 50 engineering processes in a workshop was recorded. (i) Complete the cumulative frequency column in the table below. Time (minutes) Tally Cumulative frequency 0 < t < t < t < t < t < t [1] (ii) Use the grid in Fig. 2 to draw a cumulative frequency diagram for this data. Fig. 2 [3] (iii) Use your cumulative frequency diagram to find an estimate for the median number of minutes taken to carry out the workshop processes.... [1] (iv) Use your cumulative frequency diagram to find the 60th percentile.... [1] Turn over
10 (b) Using the table provided, determine the mean and the standard deviation of: 10 27, 35, 23, 40 and 35. x x / x = / x 2 = Mean =... [1] Standard deviation = [3] [Total: 10]
11 11 5 (a) (i) Velocity v is given by the formula v = u + at. Determine the values of u and a if v = 60 when t = 10 and v = 30 when t = [6] (ii) Calculate the velocity v when t = [1] (b) Solve the quadratic equation 3x x + 8 = [3] [Total: 10] Turn over
12 6 (a) In a triangle ABC, AB = 5 m, AC = 8 m and angle ABC = 42. Calculate the angle ACB [4] (b) In another triangle ABC, side a = 40 mm, side b = 70 mm and angle C = 50. Calculate the length of side c.... [4] (c) Show that sin 30 + cos 60 + tan 45 = [2] [Total: 10]
13 13 7 (a) Integrate cos 2x + 1/x 2 + x with respect to x.... [5] (b) The distance, d metres, travelled by a vehicle in a time interval between t 1 seconds and t 2 seconds is given by: d = y v( t) dt where v(t) ms 1 is the vehicle s speed at time t seconds. t 1 t 2 If v(t) = 4 + 6t, calculate the distance travelled by the vehicle 5 seconds after it starts from the rest.... [3] (c) The force F newtons acting on a mass at distance s metres from a fixed point is given by F = 8s s 2. Calculate the work done when the mass is moved from distance s 1 2 metres to a distance s 2 of 6 metres given that: work done = s s y F ds [2] [Total: 10] Turn over
14 14 8 (a) Explain, using an example, the meaning of the term: Dependent event.... [2] (b) There are 110 brass screws, 120 steel screws and 70 aluminium screws in a container. Three screws are taken randomly from the container without being replaced. Determine the probability that the three screws taken from the container are all steel.... [4] (c) Complete the table below. For each pair of events write in the right hand column mutually exclusive or not mutually exclusive. Event When tossing two coins, getting at least one head and getting two tails. When choosing a person at random from a football crowd: choosing a female and choosing a female with blonde hair. When picking a playing card at random from a pack: getting a diamond and getting a red card. When throwing two dice, getting at least one six and getting a total score of 4. [4] [Total: 10]
15 15 BLANK PAGE PLEASE DO NOT WRITE ON THIS PAGE
16 16 PLEASE DO NOT WRITE ON THIS PAGE Oxford Cambridge and RSA Copyright Information OCR is committed to seeking permission to reproduce all third-party content that it uses in its assessment materials. OCR has attempted to identify and contact all copyright holders whose work is used in this paper. To avoid the issue of disclosure of answer-related information to candidates, all copyright acknowledgements are reproduced in the OCR Copyright Acknowledgements Booklet. This is produced for each series of examinations and is freely available to download from our public website ( after the live examination series. If OCR has unwittingly failed to correctly acknowledge or clear any third-party content in this assessment material, OCR will be happy to correct its mistake at the earliest possible opportunity. For queries or further information please contact the Copyright Team, First Floor, 9 Hills Road, Cambridge CB2 1GE. OCR is part of the Cambridge Assessment Group; Cambridge Assessment is the brand name of University of Cambridge Local Examinations Syndicate (UCLES), which is itself a department of the University of Cambridge.
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