2017 Neco gce Physics /Essay/Obj/theory runz/expo Nov/Dec

2017 Neco gce Physics /Essay/Obj/theory runz/expo Nov/Dec

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NECO GCE PHYSICS OBJ AND THEORY


1a) 


I)

 Regular maintenance is essential to keep machines and the work environment safe and reliable.

II)

 It helps to eliminate workplace hazards.

1aii)  

Electrolysis can be used for electroplating of metals.

+++++++++++++++++++++++


3a)

 couple is a system of forces with a resultant (a.k.a. net or sum) moment but no resultant force. 

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4a)

The statement: The linear expansivity of copper is 0.000017k^-1 means that, A unit length of copper will expand in length by a fraction 0.000017k^-1 of the original per Kelvin rise in temperature.

4b) 

In plane mirror, if the object is
upright, the image is also upright, of same
size and does not change in size by moving
the mirror towards or away from the face.
 *While* in concave mirror, if the object is
upright, the image is also upright but
magnified and increases in size by moving the
mirror away from the face.

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15a)

The degree to which a specified material conducts electricity, calculated as the ratio of the current density in the material to the electric field which causes the flow of current.
6a)wavelength of a is the spatial period of the wave I.e the distance over which the wave's shape repeats, and thus the inverse of the spatial frequency.
7a

Critical angle c is the incident angle in the sender medium when the angle of refraction in the less medium is 90%.



7b
Sound waves are longitudinal wave(they travel in the same direction as the vibration) 
While

Light wave are transverse waves (they travel at right angles to the vibration)

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