Physics Obj & Theory Answers / Expo /Runz / Neco 2017

Neco Physics Obj & Theory Anwers


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1a)
i)Propellant
ii)Nozzle

1aii)
i)Used for communication
ii)Used to access geographical dispersed terrains and even topography that characterise the nation's landscape

1b)
Given:
Object distance for eyepiece=3.0cm
Final image distance V =?
Focal length of eyepiece f=5.0cm
Using mirror / lens formular

1/f = 1/u  + 1/v
1/5= 1/3 + 1/v
Multiplying through with 15v
3v = 5v + 15
3v - 5v = 15
-2v = 15
V =  - 15/2
V= - 7.5cm

The final image is virtual and 7.5cm from the eyepiece on the same side of the eyepiece as the object
___________
4a)
The specific latent heat of vaporization of a substance is the quantity of heat required to change a unit mass of the substance from liquid to vapour without change of temperature

4b)
Kinetic energy is that possessed by a body due to its motion.  While potential energy is that possessed by a body due to its height or state
__________
5a)
i) solar
ii) wind

5b)
Given:
M1=15kg,  U1 =10m/s ,  V  =?
M2 = 5kg,  U2 =0 m/s

Using
M1V1 + M2V2 = V(M1 + M2)
15(10) + 5(0)  V(15 + 5)
150 = 20V
==>20V = 150
V = 150 / 20
V= 7. 5m/s
Common velocity  =7.5m/s

9a)
i) Over charging(for secondary cell) ii)self discharge (for primary cell)

9b)
Self discharge:A primary cell lose a considerable percentage of their charge when stored at room temperature. This is due to non-current producing "side" chemical reaction that occur within the cell even when no load is applied
_________-
10)
i)Fusion is more easily achieved with lightest elements such as hydrogen
ii) The raw materials required for fusion are more cheaply and readily available
iii) Fusion process produce less dangerous  by-products

12ai)
Newtons second law of motion state that the rate of change of momentum of a body is proportional to the applied force and take place in the direction of the surface

12aii)
i)A swinging pendulum
ii) motion of the balance wheel of a watch

12bi)
A resultant force is that single force which could have the same effect in magnitude and direction as the original force acting together

(12bii)
Am equilibrium force is that single force which will balance all the other forces taken together.it is equal in magnitude but opposite in direction to the resultant  force

12ci)
Resultant force  F =√4^2 + 3^2
F =√16 + 9
F =√25
F=5N

2cii)
Using F =  m(v -  u) / t

5= 5.5 (v - 2) / (5 × 60)
=5 × 60×5 = 5.5(V-2)
5.5(V -  2) = 1500
V - 2 = 272.7
V=272.7 + 2
V=274.7m/s

Final velocity of body is = 274.7m/s

15a)
Coulomb's law state that magnitude of the electrostatic force of attraction between two point charges is directly proportional to the product of the magnitudes of the charges and inversely proportional to the square of the distance  between them

15bi)
Diagram(will sent as image)

15bii)
Let equivalent resistance be  R
1/R  = 1/R1 + 1/R2 + 1/R3
I/R = R2R3 + R1R3 + R1R2 / R1R2R3
R= R1R2R3 / R1R2+R2R3+R1R3

15c)

GIVEN!
200Ω C =4mf   f=50h2   π =3.14
Impedance  Z =√R^2 + (1/2Ω + c) ^2
Z =√200^2 + (1/2×3.145×50×4×10^-6)^2
Z=√200^2  + 796.178^2
Z=√40000 + 633900
Z=√673900
Z=821Ω