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# Get Waec 2019 Physics Obj & Theory Answers Here

2019 WAEC Physics Obj and Theory Answers expo runs runz .To see the answers, kindly keep refreshing this page. it will be posted shortly………………….

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PHYSICS OBJECTIVES ANSWERS

1-10 CBBBCACCDB
11-20 DCDBBBCDCD
21-30 BBDBCBBBDA
31-40 BDABBCAABC
41-50 ABDADDCCAA

1). Mass = 20g, = 0.02kg
K= 200Nm-1
E= 5cm = 0.05m
potential energy of spring = Kinetic energy of the stone.
1/2ke² = 1/2mv²
ke²=mv²
v² = ke²/m
v² = 200× (0.05)²/0.02

v² = 25

V=√25
V= 5m/s

Hence the speed with which the ball leaves the catapult is 5m/s

2a).
P -Initial velocity of the particle at an angle θ to the horizontal.

β – Angle of projection.

H – Maximum height reached by the projectile.

R – Range or total horizontal distance covered by the projectile.

(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

(3a)
(i) magnetic declination
(ii) magnetic inclination
(iii) horizontal components

8ai Terminal velocity is the highest velocity attainable by an object as it falls through a fluid (air is the most common example). It occurs when the sum of the drag force ( Fd ) and the buoyancy is equal to the downward force of gravity (F G ) acting on the object. Since the net force on the object is zero, the object has zero
acceleration . 
In fluid dynamics , an object is moving at its termin

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( 9a)

i) latent heat is the heat required to convert a solid into a liquid or vapour, or a liquid into a vapour, without change of temperature.

9aii)

√ temperature
√ humidity

(9aii)
1. Temperature . As the temperature increases, the rate of evaporation also increases.

2. Surface Area . As the Surface area increases, the rate of evaporation increases.

(9b)
(i) Clay is proper conductor of heat than plastic

(ii) An in pressure in the cooker increases the ambient temperature in the cooker, hence the food cooks faster

(9c)
Change in the state of a substance
Increase in temperature

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(10a)

Atomic spactra is the spectra of frequencies of electromagnetic radiation emitted or absorbed during transitions of electrons between energy levels within an atom.
Typing in progress….

PHYSICS OBJ

23D

24B

25B

26D

27B

28

29D

30A

31B

32D

33D

34B

35B

36C

37A

38A

39B

40C

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