Questions — OCR MEI (4456 questions)

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OCR MEI Paper 1 2021 November Q11
11 marks Standard +0.3
11 A balloon is being inflated. The balloon is modelled as a sphere with radius \(x \mathrm {~cm}\) at time \(t \mathrm {~s}\). The volume \(V \mathrm {~cm} ^ { 3 }\) is given by \(\mathrm { V } = \frac { 4 } { 3 } \pi \mathrm { x } ^ { 3 }\). The rate of increase of volume is inversely proportional to the radius of the balloon. Initially, when \(t = 0\), the radius of the balloon is 5 cm and the volume of the balloon is increasing at a rate of \(21 \mathrm {~cm} ^ { 3 } \mathrm {~s} ^ { - 1 }\).
  1. Show that \(x\) satisfies the differential equation \(\frac { \mathrm { dx } } { \mathrm { dt } } = \frac { 105 } { 4 \pi \mathrm { x } ^ { 3 } }\).
  2. Find the radius of the balloon after two minutes.
  3. Explain why the model may not be suitable for very large values of \(t\).
OCR MEI Paper 1 2021 November Q12
7 marks Standard +0.3
12 A box of mass \(m \mathrm {~kg}\) slides down a rough slope inclined at \(15 ^ { \circ }\) to the horizontal. The coefficient of friction between the box and the slope is 0.4 . The box has an initial velocity of \(1.2 \mathrm {~m} \mathrm {~s} ^ { - 1 }\) down the slope. Calculate the distance the box travels before coming to rest.
OCR MEI Paper 1 2021 November Q13
13 marks Standard +0.3
13 In this question \(\mathbf { i }\) and \(\mathbf { j }\) are unit vectors in the \(x\) - and \(y\)-directions respectively.
The velocity of a particle at time \(t \mathrm {~s}\) is given by \(\left( 3 t ^ { 2 } \mathbf { i } + 7 \mathbf { j } \right) \mathrm { m } \mathrm { s } ^ { - 1 }\). At time \(t = 0\) the position of the particle with respect to the origin is \(( - \mathbf { i } + 2 \mathbf { j } ) \mathrm { m }\).
  1. Determine the distance of the particle from the origin when \(t = 2\).
  2. Show that the cartesian equation of the path of the particle is \(x = \left( \frac { y - 2 } { 7 } \right) ^ { 3 } - 1\).
  3. At time \(t = 2\), the magnitude of the resultant force acting on the particle is 48 N . Find the mass of the particle.
OCR MEI Paper 1 Specimen Q1
2 marks Easy -1.2
1 Fig. 1 shows a sector of a circle of radius 7 cm . The area of the sector is \(5 \mathrm {~cm} ^ { 2 }\). \begin{figure}[h]
\includegraphics[alt={},max width=\textwidth]{ff44367e-c992-4e79-b255-5a04e0b8e21e-04_222_199_621_306} \captionsetup{labelformat=empty} \caption{Fig. 1}
\end{figure} Find the angle \(\theta\) in radians.
OCR MEI Paper 1 Specimen Q2
3 marks Moderate -0.8
2 A geometric series has first term 3. The sum to infinity of the series is 8 .
Find the common ratio.
OCR MEI Paper 1 Specimen Q3
4 marks Easy -1.2
3 Solve the inequality \(| 2 x - 1 | \geq 4\).
OCR MEI Paper 1 Specimen Q4
6 marks Moderate -0.8
4 Differentiate the following.
  1. \(\sqrt { 1 - 3 x ^ { 2 } }\)
  2. \(\frac { x ^ { 2 } } { 3 x + 2 }\)
OCR MEI Paper 1 Specimen Q5
4 marks Moderate -0.3
5 A woman is pulling a loaded sledge along horizontal ground. The only resistance to motion of the sledge is due to friction between it and the ground. \begin{figure}[h]
\includegraphics[alt={},max width=\textwidth]{ff44367e-c992-4e79-b255-5a04e0b8e21e-05_314_1024_486_356} \captionsetup{labelformat=empty} \caption{Fig. 5}
\end{figure} At first, she pulls with a force of 100 N inclined at \(32 ^ { \circ }\) to the horizontal, as shown in Fig.5, but the sledge does not move.
  1. Determine the frictional force between the ground and the sledge. Give your answer correct to 3 significant figures.
  2. Next she pulls with a force of 100 N inclined at a smaller angle to the horizontal. The sledge still does not move. Compare the frictional force in this new situation with that in part (a), justifying your answer.
OCR MEI Paper 1 Specimen Q6
4 marks Moderate -0.8
6 Fig. 6 shows a partially completed spreadsheet.
This spreadsheet uses the trapezium rule with four strips to estimate \(\int _ { 0 } ^ { \frac { 1 } { 2 } \pi } \sqrt { 1 + \sin x } \mathrm {~d} x\). \begin{table}[h]
ABCDE
1\(x\)\(\sin x\)\(y\)
200.00000.00001.00000.5000
30.1250.39270.38271.17591.1759
40.250.78540.70711.30661.3066
50.3751.17810.92391.38701.3870
60.51.57081.00001.41420.7071
75.0766
8
\captionsetup{labelformat=empty} \caption{Fig. 6}
\end{table}
  1. Show how the value in cell B3 is calculated.
  2. Show how the values in cells D2 to D6 are used to calculate the value in cell E7.
  3. Complete the calculation to estimate \(\int _ { 0 } ^ { \frac { 1 } { 2 } \pi } \sqrt { 1 + \sin x } \mathrm {~d} x\). Give your answer to 3 significant figures.
OCR MEI Paper 1 Specimen Q7
10 marks Moderate -0.3
7 In this question take \(\boldsymbol { g } = \mathbf { 1 0 }\).
A small stone is projected from a point O with a speed of \(26 \mathrm {~m} \mathrm {~s} ^ { - 1 }\) at an angle \(\theta\) above the horizontal. The initial velocity and part of the path of the stone are shown in Fig. 7.
You are given that \(\sin \theta = \frac { 12 } { 13 }\).
After \(t\) seconds the horizontal displacement of the stone from O is \(x\) metres and the vertical displacement is \(y\) metres. \begin{figure}[h]
\includegraphics[alt={},max width=\textwidth]{ff44367e-c992-4e79-b255-5a04e0b8e21e-07_419_479_904_248} \captionsetup{labelformat=empty} \caption{Fig. 7}
\end{figure}
  1. Using the standard model for projectile motion,
    The stone passes through a point A . Point A is 16 m above the level of O .
  2. Find the two possible horizontal distances of A from O . A toy balloon is projected from O with the same initial velocity as the small stone.
  3. Suggest two ways in which the standard model could be adapted.
OCR MEI Paper 1 Specimen Q8
7 marks Standard +0.3
8 Find \(\int x ^ { 2 } \mathrm { e } ^ { 2 x } \mathrm {~d} x\).
OCR MEI Paper 1 Specimen Q9
8 marks Standard +0.3
9 In an experiment, a small box is hit across a floor. After it has been hit, the box slides without rotation. The box passes a point A. The distance the box travels after passing A before coming to rest is \(S\) metres and the time this takes is \(T\) seconds. The only resistance to the box's motion is friction due to the floor. The mass of the box is \(m \mathrm {~kg}\) and the frictional force is a constant \(F\).
    1. Find the equation of motion for the box while it is sliding.
    2. Show that \(S = k T ^ { 2 }\) where \(k = \frac { F } { 2 m }\).
  2. Given that \(k = 1.4\), find the value of the coefficient of friction between the box and the floor.
OCR MEI Paper 1 Specimen Q10
15 marks Standard +0.3
10 In a certain region, the populations of grey squirrels, \(P _ { \mathrm { G } }\) and red squirrels \(P _ { \mathrm { R } }\), at time \(t\) years are modelled by the equations: \(P _ { \mathrm { G } } = 10000 \left( 1 - \mathrm { e } ^ { - k t } \right)\) \(P _ { \mathrm { R } } = 20000 \mathrm { e } ^ { - k t }\) where \(t \geq 0\) and \(k\) is a positive constant.
    1. On the axes in your Printed Answer Book, sketch the graphs of \(P _ { \mathrm { G } }\) and \(P _ { \mathrm { R } }\) on the same axes.
    2. Give the equations of any asymptotes.
  2. What does the model predict about the long term population of
    Grey squirrels and red squirrels compete for food and space. Grey squirrels are larger and more successful than red squirrels.
  3. Comment on the validity of the model given by the equations, giving a reason for your answer.
  4. Show that, according to the model, the rate of decrease of the population of red squirrels is always double the rate of increase of the population of grey squirrels.
  5. When \(t = 3\), the numbers of grey and red squirrels are equal. Find the value of \(k\).
OCR MEI Paper 1 Specimen Q11
9 marks Standard +0.3
11 Fig. 11 shows the curve with parametric equations $$x = 2 \cos \theta , y = \sin \theta , 0 \leq \theta \leq 2 \pi .$$ The point P has parameter \(\frac { 1 } { 4 } \pi\). The tangent at P to the curve meets the axes at A and B . \begin{figure}[h]
\includegraphics[alt={},max width=\textwidth]{ff44367e-c992-4e79-b255-5a04e0b8e21e-10_668_1075_543_255} \captionsetup{labelformat=empty} \caption{Fig. 11}
\end{figure}
  1. Show that the equation of the line AB is \(x + 2 y = 2 \sqrt { 2 }\).
  2. Determine the area of the triangle AOB .
OCR MEI Paper 1 Specimen Q12
9 marks Standard +0.3
12 A model boat has velocity \(\mathbf { v } = ( ( 2 t - 2 ) \mathbf { i } + ( 2 t + 2 ) \mathbf { j } ) \mathrm { m } \mathrm { s } ^ { - 1 }\) for \(t \geq 0\), where \(t\) is the time in seconds. \(\mathbf { i }\) is the unit vector east and \(\mathbf { j }\) is the unit vector north.
When \(t = 3\), the position vector of the boat is \(( 3 \mathbf { i } + 14 \mathbf { j } ) \mathrm { m }\).
  1. Show that the boat is never instantaneously at rest.
  2. Determine any times at which the boat is moving directly northwards.
  3. Determine any times at which the boat is north-east of the origin.
OCR MEI Paper 1 Specimen Q14
9 marks Moderate -0.3
14 Blocks A and B are connected by a light rigid horizontal bar and are sliding on a rough horizontal surface. A light horizontal string exerts a force of 40 N on B .
This situation is shown in Fig. 14, which also shows the direction of motion, the mass of each of the blocks and the resistances to their motion. \begin{figure}[h]
\includegraphics[alt={},max width=\textwidth]{ff44367e-c992-4e79-b255-5a04e0b8e21e-11_266_1283_664_255} \captionsetup{labelformat=empty} \caption{Fig. 14}
\end{figure}
  1. Calculate the tension in the bar. The string breaks while the blocks are sliding. The resistances to motion are unchanged.
  2. Determine
OCR MEI Paper 1 Specimen Q15
6 marks Standard +0.3
15 Fig. 15 shows a uniform shelf AB of weight \(W \mathrm {~N}\).
The shelf is 180 cm long and rests on supports at points C and D . Point C is 30 cm from A and point D is 60 cm from B .
side view \begin{figure}[h]
\includegraphics[alt={},max width=\textwidth]{ff44367e-c992-4e79-b255-5a04e0b8e21e-11_284_1169_1987_383} \captionsetup{labelformat=empty} \caption{Fig. 15}
\end{figure} Determine the range of positions a point load of \(3 W\) could be placed on the shelf without the shelf tipping. \section*{Copyright Information:} }{www.ocr.org.uk}) 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, The Triangle Building, Shaftesbury Road, Cambridge CB2 8EA.
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OCR MEI Paper 2 2018 June Q1
2 marks Easy -1.8
1 Show that \(\sqrt { 27 } + \sqrt { 192 } = a \sqrt { b }\), where \(a\) and \(b\) are prime numbers to be determined.
OCR MEI Paper 2 2018 June Q2
3 marks Easy -1.8
2 Solve the inequality \(| 2 x + 1 | < 5\).
OCR MEI Paper 2 2018 June Q3
2 marks Easy -1.8
3 The probability that Chipping FC win a league football match is \(\mathrm { P } ( W ) = 0.4\).
  1. Calculate the probability that Chipping FC fail to win each of their next two league football matches. The probability that Chipping FC lose a league football match is \(\mathrm { P } ( L ) = 0.3\).
  2. Explain why \(\mathrm { P } ( W ) + \mathrm { P } ( L ) \neq 1\).
OCR MEI Paper 2 2018 June Q4
2 marks Easy -1.3
4 A survey of the number of cars per household in a certain village generated the data in Fig. 4. \begin{table}[h]
Number of cars01234
Number of households82231277
\captionsetup{labelformat=empty} \caption{Fig. 4}
\end{table}
  1. Calculate the mean number of cars per household.
  2. Calculate the standard deviation of the number of cars per household.
OCR MEI Paper 2 2018 June Q5
3 marks Easy -1.2
5
  1. (A) Sketch the graph of \(y = 3 ^ { x }\).
    (B) Give the coordinates of any intercepts. The curve \(y = \mathrm { f } ( x )\) is the reflection of the curve \(y = 3 ^ { x }\) in the line \(y = x\).
  2. Find \(\mathrm { f } ( x )\).
OCR MEI Paper 2 2018 June Q6
5 marks Moderate -0.3
6
  1. Express \(7 \cos x - 24 \sin x\) in the form \(R \cos ( x + \alpha )\), where \(0 < \alpha < \frac { \pi } { 2 }\).
  2. Write down the range of the function $$f ( x ) = 12 + 7 \cos x - 24 \sin x , \quad 0 \leqslant x \leqslant 2 \pi .$$
OCR MEI Paper 2 2018 June Q7
4 marks Easy -1.2
7 Find \(\int \left( 4 \sqrt { x } - \frac { 6 } { x ^ { 3 } } \right) \mathrm { d } x\). Answer all the questions
Section B (79 marks)
OCR MEI Paper 2 2018 June Q8
4 marks Moderate -0.8
8 Every morning before breakfast Laura and Mike play a game of chess. The probability that Laura wins is 0.7 . The outcome of any particular game is independent of the outcome of other games. Calculate the probability that, in the next 20 games,
  1. Laura wins exactly 14 games,
  2. Laura wins at least 14 games.