Question Answer Marks Guidance 1 (i) A: ( 2) + 12 = 0 B: ( 2.5) + 12 = 0 E: ( 2) + 12 = 0 [4] [2] r n a n with n 6
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- Juliana Greer
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1 1 (i) A: ( 2) + 12 = 0 B: + 6.( 2.5) + 12 = 0 E: ( 2) + 12 = 0 B2,1,0 for two points verified (must see as a minimum = 0, = 0, = 0) or any valid complete method for either finding or verifying that x 6y12 0 gets At F, 2 + 6a + 12 = 0 Substitution of F into x 6y12 0 6a = 14, a = 14/6 = 7/ * www NB AG 1 (ii) (A) DH (6) [4] scalar product with a direction vector in the plane (including evaluation and = 0) (OR forms a vector product with at least two correct terms in solution) 1 (ii) (B) 1 1 DC (6) r.(i 6j) = j.(i 6j ) scalar product with second direction vector, with evaluation. (following OR above, correct ie a multiple of i 6j) (NB finding only one direction vector and its scalar product is only) rn an with n 6 and 1 or 1 or 1.5 a or substituting H(0, 1, ) or D(0, 1, 0) or C(, 1.5, 0) into x 6y d x 6y + 6 = 0 oe (isw if d found correctly and x 6y = d stated) B2 www correct equation stated 1 (ii) (C) 2 6b + 6 = 0 b = 4/ oe exact answer FG 1 2 oe exact answer
2 1 (iii) ( FE =) 2i + (1/)j + k, ( FB=) i (1/6)j 2k or (EF ) 2i (1/ ) jk or (BF ) i (1/ 6) j 2k 2(1) (1/ )(1/ 6) 1(2) cos 4 1/ / arccos q = 14 OR EF = 46 /, FB = 181 / 6, EB = 7 / 2 arccos 46 / 181 / 6 7 / ( 46 / )( 181 / 6) 1 (iv) z coordinate of P is 5/ OQ OP PQ 1 / 6 1 / / 2 5 / 2 cos FE FB / FE FB (oe) follow through their FE and FB (allow any combination of FE, EF with FB, BF) allow one sign slip only 2 1/ arccos arccos [5] sf or better (or 2.5(0) radians or better). Allow candidates who find the acute angle using either EF with FBor FEwith BF and then state the obtuse angle. Do not isw those who find the obtuse angle and then state the acute angle. Note: 90 2arctan(1/ 2) is 0/5 B,2,1,0 One mark for each (2.26, 2.24, 4.27) so height of Q is 8/ (metres above ground) 2.67 or better [] cosine rule correct with their EF, FB, EB q = 14 stating the correct z-coordinate of P; ignore incorrect x and y coordinates (or stated in a position vector) Complete method for finding the z-coordinate of Q or OQ (OH) (2 / )(HP) or OQ ( 2 / )(OP) (1/ )(OH)
3 2 (i) AB = 5 2 ( 2) or better (condone sign error in vector for ) 29 AC = Accept 25 (condone sign error in vector for ) cos Area = ½ 5 = sin = [7] cosθ = scalar product of AB with AC (accept BA/CA) AB. AC with substitution condone a single numerical error provided method is clearly understood [OR Cosine Rule, as far as cos θ= correct numerical expression ] www ± , 0.557,15/5 29,15/ oe or better soi ( ± for method only) www Accept answers that round to 56.1º or 56.2º or 0.98 radians (or better) NB vector 5i+0j+2k leads to apparently correct answer but loses all A marks in part(i) Using their AB,AC, trigonometry CAB. Accept any valid method using Accept 5 5 and answers that round to or (2dp) www or SC for accurate work soi rounded at the last stage to 11.2 (but not from an incorrect answer, say from an incorrect angle or from say or stated and rounded to 11.2) We will not accept inaccurate work from over rounded answers for the final mark.
4 2 (ii) (A) AB ( ) ( 2) Scalar product with one vector in the plane with numerical expansion shown. 4 4 AC ( ) Scalar product, as above, with evaluation, with a second vector. NB vectors are not unique SCB2 finding the equation of plane first by any valid method (or using vector product) and then clearly stating that the normal is proportional to the coefficients. 2 (ii) (B) 4x y+10z=c SC For candidates who substitute all three points in the plane 4x-y+10z = c and show that they give the same result, award If they include a statement explaining why this means that 4i-j+10k is normal they can gain. Required form and substituting the co-ordinates of a point on the plane 4x y + 10z + 12 = 0 oe If found in (A) it must be clearly referred to in (B) to gain the marks. Do not accept vector equation of the plane, as Hence. 4i-j+10k = 12 is A0
5 2 (iii) 0 r 4 Need r = (or x y ) 5 z. 4 oe 10 Meets 4x y + 10z + 12 = 0 when 16 (4 ) + 10( ) + 12 = = 50, = 0.4 So meets plane ABC at ( 1.6, 5.2, 1) [5] Subst their 4λ, 4 λ, 5+10λ in equation of their plane from (ii) λ= 0.4 (NB not unique) cao www (condone vector) 2 (iv) height = ( ( 1.2) )= 20 ft volume = / = 16.7 cao ft their (iii) 50/ or answers that round to 16.7 www and not from incorrect answers from (iii) ie not from say (1.6,2.8,9)
6 (i) (ii) 0 r 1... x + y + 2z = λ (1+ ) + 2(+2 ) = 4 5 = 5, = 1 so point of intersection is (2, 0, 1) [] x y need r (or another letter) = or z for first 2 2 NB answer is not unique eg r Accept i/j/k form and condone row vectors. substituting their line in plane equation (condone a slip if intention clear) www cao NB λ is not unique as depends on choice of line in (i) www cao (iii) Angle between 2i + j + 2k and i + j +2k is where Angl between i+j+2k and their direction from (i) ft condone a single sign slip if intention clear cosθ = 6.5 [] correct formula (including cosine), with substitution, for these vectors condone a single numerical or sign slip if intention is clear www cao (6.5 in degrees (or better) or radians or better)
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