Neco physics answer

PHYSICS ANSWERS
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PHYSICS OBJ:
1-10 CEABCBAABB
11-20: DCCBCBCCAE
21-30: BECDDBEDDE
31-40: DBAEADBABA
41-50: CBDCBBBDCB
51-60: CEDDCBAEAA
PART I - ANSWER 6
1ai)
i)propellant
ii)nozzle
1aii)
i)used for communication
ii)used for access geographically
dispersed
terrains and uneven topography that
characterise the nations landscappe
1b)
Given: Object distance for eyepiece,
U=3.0cm
Final image distance, V=?
Focal length of eyepiece, F=5.0cm
using the mirror/lens formular
1/f=1/u+1/v
1/5=1/3+1/v
multiplying through with 15v(1.cm)
3v=5v+15
3v-5v=15
-2v=-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
2)
Given Radius, r=25m
linear velocity, v=20m|s
centripetal acceleration,a=?
Using:
a=V^2/r2
a=20^2/25
a=16m|s^2
6a)
A wave front is the locus of points
characterized by propagation of position
of
the same phase: a propagation of a line
in
1D, a curve in 2D or a surface for a wave
in
3D. In other words a line or surface in the
path of an advancing wave on which all
the
particles are vibrating in phase is called a
wave front.
6b)
i)plane wave front
ii)spherical wave front
7)
Pupil- Regulates the amount of light
entering
the eye
Shutter-admits or shuts off light from the
film
of the camera
Screen-used to focus light from a near
object
in front of the pinhold camere
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
reactions 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 fussion
are
more cheaply and readily available
iii)fusion process produce less dangerous
by
product
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PART II - ANSWER 4
12ai)
Newton's second law of motion states that
the rate of change of momentum is
proportional to the impressed fotvr and
takes
place in the direction of the force
12aii)
i)a swinging pendulum
ii)The motion of the balance wheel of a
watch
12bi)
Resultant force is that single force which
acting alone will have the same effect in
magnitude and direction as two or more
forces acting together
12bii)
Equilbrum force is that single force which
will
balance all the other forces taken
together. It
is equal in magnitude buy opposite in
direction to the resultant force
12ci)
Resultant,Force,F=sqr4^2+3^2
F=sqr16+9
Fsqr25=5N
12cii)
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 = 274.7m|s