Physics NECO essay

*YOU ARE TO ANSWER SIX QUESTION*
*FROM.SECTION A*
*FOUR QUESTION FROM PART B*
*NECO 2018 PHYSICS (THEORY AND OBJ) SOLUTION*

1a) Electricity is produced from a dam by first restricting the flow of water from one end of the dam to the other, concentrating the water and making it so that the water flowing through the dam has a higher velocity. The water flows through a turbine, or series of turbines. The lateral velocity of the water turns the turbines. The water escapes out the other end of the dam.
The turbine is connected to a shaft and a generator, essentially a large magnet with a coil of wires around it. Moving the magnet or the coils around generates the electricity. The basic premise is to get the magnet or coils inside the generator to move, and in a hydroelectric power plant, the energy in the natural movement of water in streams and rivers is harnessed to do so.

6a).  The incident ray, reflected ray and normal at the point of incidence all lie on the same plane

6b i)  myopia can be corrected by placing a suitable concave or diverging lens in front of the eye

ii)  the action of the lens is to diverge the light rays entering the eye from a distant object and make them appear coming from the persons far Point

9a) (i)Plate spacing
ii)plate area
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12a) i) trajectory or flight path is the path that a massive
object in motion follows through space as a function of time.

ii) -a baseball that has been pitched, batted, or thrown
-a bullet the instant it exits the barrel of a gun or rifle
- a moving airplane in the air with its engines and wings disabled.

(13a)
Specific latent heat of fusion is the quantity of heat
energy need to convert a mass 1kg of a body from
ice to liquid without a change in temperature

(13bi) Conventional current can be defines as the flow of
electrons through the circuit and into the negative
terminal of the source

(13bii)
Practical application:
-For correcting change in electron flow
-For creating electrons for positive terminals

(13c)
Mass of water=500g=0.5kg
MC(change in tita),ML
0.5*4.2*10^3*100=[(0.5+x)*3.2*10^5]
210000=1.6*10^5+3.2*10^5x
50000=3.2*10^5x
x=50000/3.2*10^5
x=0.16kg
x=1600g


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*Updated*

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