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# WAEC 2019 Physics Obj and Essay Answer – May/June Expo

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Physics OBJ
1-10: CBBBCACBBB
11-20: BCCCABBCBB
31-40: BDDBBCAABC
41-50: ABDABDCBBA

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Physics Theory

(1)
Mass = 20g = (20/100)kg = 0.02kg
Extension = 5cm = (5/100)m = 0.05m
K = 200N/
V = ?
1/2mvsquare = 1/2kesquare
V = rootkesquare/m = root200×0.05×0.05/0.02
V = root25
V = 5m/s
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(2a)
P – Initial velocity of the projectile
B – Angle of projection
H – Maximum height reached by the projectile
R – Range or the total horizontal distance covered by the projectile
(2b)
R=P^2 sin 2beta/g
at maximum range sin2beta=1
Rmax=P^2/g
This happens at B = 45degree

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Edited
(3)
(i)reflection
(ii)refraction
(iii)diffraction
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(4)
(i)Magnetic Declination
(ii)Horizontal Component of Earth’s Magnetic Field
(iii)The angle of Dip or Magnetic Inclination
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(5a)
Free electrons are electrons in a material which can contribute to electric current.
(5b)
hole is the absence of an electron in a particular place in an atom
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(6a)
Principle of operation of fiber optics state that the density of transparent glass and the refractive index is greater than the density of the two mirrors
(6b)
(i)it is used to view deep down the throat of a patient
(ii)it is used to conveying information
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Question 4.

– Angle of declination
– Angle of Dip or inclination.
– Horizontal component of the Earth’s magnetic field at that point.

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Question 8.
It states that every particle in the universe attracts every other particle with a force that is proportional to the product of their masses and inversely proportional to the square of the distance between them.

ii) Gravitational field is a region or space around a mass in which the gravitational force of mass can be felt.

b)
i.
F = Gmm/r^2 —— From Newton’s law
where m is mass of earth.
m is any mass on earth
r is the distance at mass from earth
G is a constant at gravitation

But F = Gmm/r^2 = mg
i.e Gm/r = g
=> g = Gm/r
(8di)

Escape velocity is the velocity required for an object to escape from a gravitational influence of the earth

(8dii)
Two differences between acceleration of fall fall (g) and universal gravitational constant (G)

Tabulate
g | G

Under g>>> (i) it varies
(ii) it’s unit is ms^2

Under G>>> (i) it is constant
(ii) it’s unit is kg^2/Nm^2
===========================
(9a)
Latent heat is energy released or absorbed, by a body or a thermodynamic system, during a constant-temperature process.
(9aii)
(i)surface area in contact with atmosphere
(ii)nature of the liquid
(9bi)
Clay is poorer conductor of heat than plastic
(9bii)
An increase in pressure in the cooker increase the ambient temperature in the cooker hence the food cooks faster
(9c)
(i)Change in the state of a substance
(ii)Increase in temperature
(9di)
Heat supplied = m1
lvt = m1
12*40*1400=1.5*1
L=12*40*1400/1.5
L=672000/1.5= 448,000J/kg
Laten heat of fusion of the body = 4.48*10^5J/Kg
(9dii)
lvt=mc D tita
12*40*72=1.5*c*60
C=12*40*72/1.5*60
C=384J/Kg/K
Specific heat capacity of the body =384J/Kg/K
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Question 11.
a) i. Force is anything that cause motion. its S.I unit is Newton(N) or kgm/s^2

ii. – Static friction.
– Dynamic Friction.

b)
i. Draw the diagram.

ii) Deceleration during last 5s = 18/5 = 3.6m/s^2

iii)
Total distance = S1 + S2 + S3 + S4
= (30*20) + 1/2(18+30)(6) + (18*10) + (1/2*5*18)
= 600 + 144 + 180 + 45
= 969metre
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