Physhs-Obj

1CBBBCACBBB

11BCCCABBCBB

31BDDBBCAABC

41ABDABDCBBA

(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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Time and Date for Physics Objective and Essay 2019 WAEC Examination

Wednesday 8th May, 2019

• Physics 2 (Essay) – 09:30 a.m. – 11.00 a.m.

• Physics 1 (Objective) – 11:00 a.m. – 12:15 p.m.

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