Waec 2019 Physics Theory and Obj Answers – May/June Expo

*_Waec 2019 Physics Theory and Obj Answers – May/June Expo_*✅
  
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Physics obj


(1)
Mass = 20g = (20/100)kg = 0.02kg
Extension = 5cm = (5/100)m = 0.05m
K = 200N/
V = ?
1/2mv² = 1/2ke²
V = √ke²/m = √200×0.05×0.05/0.02
V = √25
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 2β/g
at maximum range sin2β=1
Rmax=P^2/g
This happens at β = 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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(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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