WAEC 2023 Physics | Essay

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Question 1 View Details
The force, \( F \), acting on the wings of an aircraft moving through air of velocity, \( v \), and density, \( p \), is given by the equation \( F=k \nu^{x} p^{y} A^{z} \), where \( k \) is a dimensionless constant and \( A \) is the surface area of the wings of the aircraft. Use dimensional analysis to determine the values of \( x, y \) and \( z \).
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Question 2 View Details
Question Parts
(a)
Define strain energy.
(b)
Write an expression for the energy stored, \( E \), in a stretched wire of original length, \( l \), cross-sectional area, \( A \), extension, \( e \), and Young's modulus, \( Y \), of the material of the wire.
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Question 3 View Details
Question Parts
(a)
A projectile is fired at an angle, \( \theta \), to the horizontal with velocity, \( u \). Show that at any time, \( t \), during the motion, the;
(b)
State the assumption on which projectile motion is based.
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Question 4 View Details
State three differences between geostationary satellites and polar satellites.
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Question 5 View Details
Question Parts
(a)
Using the kinetic theory, explain the term diffusion of fluid molecules.
(b)
Name one phenomenon that demonstrates that light behaves as a:
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Question 6 View Details
Question Parts
(a)
State one difference between an intrinsic and an extrinsic semiconductor.
(b)
Draw a circuit diagram to illustrate full-wave smoothing rectification.
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Question 7 View Details
Question Parts
(a)
What is fibre optics?
(b)
State two reasons why optical fibres are preferred to copper cables in the telecommunication industry.
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Question 8 View Details
Question Parts
(a)
(i) State the reason why simple harmonic motion is periodic.
(a)
(ii) State two factors that affect the period of oscillation of a simple pendulum.
(a)
(iii) Sketch a graph of the total mechanical energy, \( \mathbf{E} \), against displacement, \( y \), for the motion of a simple pendulum from one extreme position to the other.
(b)
The diagram below illustrates an oscillatory pendulum. Calculate the work done in raising the pendulum to point B, if the mass of the bob is \( 50 \mathrm{~g} .\left[g=10 m s^{-2}\right] \).
(c)
A spiral spring of spring constant, \( k \), and natural length, \( l \), has a scale pan of mass \( 0.04 k g \) hanging on its lower end while the upper end is firmly fixed to a support. When an object of mass 0.20 kg is placed on the scale pan, the length of the spring becomes \( 0.055 m \) and when the object is replaced with another object of mass 0.28 kg, the length of the spring becomes 0.6 m. Calculate the values of \( k \) and \( l \). \( [g=10 \left.m s^{-2}\right] \).
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Question 9 View Details
Define each of the following terms used with simple machines; (i) pivot; (ii) load; (iii) efficiency.
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Question 10 View Details
Question Parts
(a)
(i) Why are parabolic mirrors suitable for use in headlamps of vehicles?
(a)
(ii) Draw a ray diagram to illustrate the answer in 10a(i).
(b)
(i) State two applications of echoes.
(b)
(ii) An observer standing at a point, P, on the same horizontal ground as the foot, H, of a tower shouts and \( 1.20 s \) later, he hears the echo. He then moved to another point, \( \mathbf{Q}, 40 m \) from \( \mathbf{P} \), and shouts again but the echo was heard after \( 1.45 s \). Calculate the: I. distance between P and H; II. speed of sound in air.
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Question 11 View Details
Question Parts
(a)
(i) Define the term absolute refractive index of a medium.
(a)
(ii) A piece of coin falls accidentally into a tank containing two immiscible liquids A and B as illustrated in fig 10.0. Calculate the displacement of the coin when viewed vertically from above. [refractive index of \( A=1.3 \), refractive index of \( B=1.4 \)].
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Question 12 View Details
Question Parts
(a)
(i) Define the electric potential at a point in an electric field.
(a)
(ii) An uncharged body, A, was charged electrostatically by a test charge, B, using the method of induction and the method of contact. State two differences between the two methods.
(b)
An important precaution during an electricity experiment is to open the circuit when no readings are being taken. Give two reasons for the stated precaution.
(c)
Fig. 11.0 is a circuit diagram in which a coil of inductance, L, and a resistor of resistance, R, are connected to a variable alternating source of frequency, f. The table shows the square of the impedance, \( Z^{2} \); corresponding to each value of \( f^{2} \).
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