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Good morning to you all.. Please I need physics essay plz

A progressive wave is a term given to a wave that travels from a specific point A in the medium to another point B. In simple terms, a wave that continuously travels in a medium in the same direction minus the changes is known as a traveling wave or progressive wave.

Part I 2 a) Metal and alloy plates and plate stock are used in a variety of applications such as raw material feed for machining or forming of parts, flooring or floor fabrication, and building and construction materials.


Part ii a) DescriptionTorque is the rotational equivalent of linear force. It is also referred to as the moment, moment of force, rotational force or turning effect, depending on the field of study. The concept originated with the studies by Archimedes of the usage of levers.


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3b

To confine the optical signal in the core, the refractive index of the core must be greater than that of the cladding. The boundary between the core and cladding may either be abrupt, in step-index fiber, or gradual, in graded-index fiber. Light can be fed into optical fibers using lasers or LEDs.

(2a)
Metal flat plate: It is a collector of heat that converts the radiant solar energy from the sun into heat energy by the process of greenhouse effect.

(2b)
Thermal Insulator: It prevents loss of accumulated heat in the solar collector and thereby improves its absorption efficiency.

(2c)
Tubes: They are use to capture almost all the sun's energy. It is the most effecient solar collector.

(6)
Angle at horizontal θ = 30°
Time of light , T = 25sec
Velocity of projection u = ?
But T=2using sinθ/g
25= 2u*sin30/10
25=0.5u/5
0.5u=125
U=125/0.5
=250ms-¹
(5)
Escape velocity = VE
Radius of the earth = R
Acceleration due to gravity = 10ms²
Escape velocity Be=√2R
VE=√2*10R
VE=√20R
(2a)
Flat metal plate are mainly used to collect heat for space heating in solar panels for heat transfer.
(2b)
Thermal insulator is used for reduction of heat transfer between objects in thermal contact
(2c)
tubes is a device that controls electric current flow in a high vacuum between electrodes to which an electric potential difference has been applied.
(3a)
highly purified silica glass.
(3b)
To confine the optical signal in the core the refractive index of the core must be greater than that of the cladding.
(7)
(i)Coherence
(ii)Directionality
(iii)Monochromatic
(1)
Original length Lo= 3m
Extension e = 310 = 3*3= 9m
F×e
F=ke where k = 982.3NM-²
F=982.3*9=8,840.7N
The five that produce the extension F = 8.840.7N

(10ai)
Critical angle: this is the angle of incidence that
provides an angle of refraction of 90-degrees.
(10aii)
(i) Light must travel from a denser medium to a rarer medium and
(ii) the angle of incidence inside the denser medium must be greater than the critical angle.
CHECK OUT: WAEC 2019 CHEMISTRY OBJ AND ESSAY VERIFIED ANSWER
(10aiii)
-In elescopes application
-In microscopes applications
-In the binoculars
(10b)
(i)Bending of light;If light is moving from rarer to denser medium then it moves towards the normal.
If it is moving from denser to rarer medium then it moves away from the normal.
(ii)Change in wavelength of light
(10ci)
(i)myopia
(ii)Long sightedness
(ii)short sightedness
(10cii)
(i)concave lens
(ii)Convex lens
(iii)Contact lenses
(10di)
convex mirror has a wider field of view
(10dii)
The disadvantages of convex mirror are that they make it appear like those objects are at a more noteworthy distance than they actually are.

(8ai)
A torque is defined as a measure of the force that can cause an object to rotate about an axis
(8aii)
Factors that determine torque are;
– The magnitude of the force
– The radius
– The angle between the force and the lever arm
(8bi)
Free fall simply means the act of which are objects fall freely under the influence of gravitational force. An object under free fall does not encounter air resistance
(8bii)
Height of tower H = 40.0m
Velocity v = 10.0m/s, time t= ? , g=10.0m/s
Using the relation
S= ut + 1/2gt^2
H= ut + 1/2gt^2
40= 10t + 1/2*10t^2
4= t + t^2/2
= t^2 + 2t – 8=0 ( solving quadratically)
= (t+4)(t-2)=0
t+4=0 or t-2=0
t= -4 or t=2
Therefore time to fall on the ground t=2s
(8c)
R.d of oil =R1 = 0.72
R.d of water = R2=1.00
R.d of liquid= R1/R2= 0.72/1 = 0.72
R.d = density of wood(P1)/density of water(P2)
0.72=P1/1.00
P1= 0.72*1.00=0.72g/cm³
But density of wood= mass of wood/volume of wood
0.72= mass of wood/8*8*8
Mass of wood = 0.72*512 = 368.64g

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