1bi)The Moment of a force is a measure of its tendency to cause a body to rotate about a specific point or axis. This is different from the tendency for a body to move, or translate, in the direction of the force. ... It is defined as the product of the force (F) and the moment arm (d).
3bi)Advantages: Connecting batteries in parallel, every unit that is connected in a parallel circuit gets equal amount of voltage.
- If there is a break in the circuit, the current is able to pass through the circuit through different paths
3bii)
-Resistance.
-Tolerance.
-Rated Power Dissipation.
-Package and mounting.
-Voltage rating.
bi) Dispersion of light is the splitting of white light into its constituent colors due to the refractive index of the surface and the wavelength of the light.
1.connecting cells in parallel adds the current capacities together.
2.connecting cells in parallel provide alternative Pathways for Current flows.
3.When cells are connected in parallel the Total voltage provided do not change
Choose only TWO
1.connecting cells in parallel adds the current capacities together.
2.connecting cells in parallel provide alternative Pathways for Current flows.
3.When cells are connected in parallel the Total voltage provided do not change
(xv) i. I ensured that the pins are vertu ally erect
ii. I avoided error due to parallax when taking readings on the protractor and the meter rule
iii. I ensured neat traces
Iv. I ensured that the pins are reasonable spaced
(1bi)
Moment of a force can be defined as the product of the force and its perpendicular distance from its point of action.
(1bii)
(3a)
(i)E=3.00v
Tabulate.
R(n); 1.0|2.0|4.0|6.0|8.0
I(A)0.40|0.35|0.28|0.22|0.18|
V(v)0.65|0.58|0.50|0 45|0.40|
(3bi)
(i) I avoided error due to parallax when reading the ammeter and voltmeter
(ii)I ensure tight connection.
(3bi)
(i)it increase current supplied
(ii)it makes up for any detect on any cells
(3bii)
(i)The length of the resistor.
(ii)The thickness of the resistor.
[8/20, 10:11 AM] +234 802 081 4977: (3ai)
E = 3.00V
R(ohms) | I(A) | V(v)
1.0 0.40 0.65
2.0 0.35 0.58
4.0 0.28 0.50
6.0 0.22 0.45
8.0 0.18 0.40
(3aix)
(i) I avoided error due to parallax when reading the ammeter and voltmeter.
(ii) I ensured tight connections.
(3bi)
(i) It increases current supplied.
(ii) It makes up for any defect in any of the cells.
(3bii)
(i) Resistivity of the wire or coil.
(ii) Length of the material
[8/20, 10:11 AM] +234 802 081 4977: *Q 2b ii*
n = 1/SinC
1.5 = 1/SinC
SinC = 1/1.5
C = Sin-¹(1/1.5)
C = Sin-¹(0.667)
C = *41.835°*
1aix)
Slope = △M/△X-¹ = M2 - M1 / X2-¹ -X1-¹
S = 120.0 - 40/80.0 - 27
= 80/53
S = 1.509 x 10³ = 1509
(1ax)
S = YMo
1509 = 30 Mo
Mo =1509/30
Mo =50.3
(1axi)
PRECAUTIONS
(i) I ensured that the metre rule balances horizontally before readings are taken in order to avoid experimental error.
(ii) I ensured that parallax error was avoided when taking the readings on the metre rule by viewing its calibrations vertically.
(1bi)
The moment of a force about a point is defined as the effect of force about that point.
Moment of a force = force × perpendicular distance of its line of action from the point.
Moment = F × h
The S.I unit is Newton-metre(Nm). It is a vector quantity
(1bii)
Draw the diagram
X = 50 - 25 = 25cm
y = 80 - 50 = 30cm
From the principle of moment :
Sum of clockwise moment = sum of anticlockwise moment
60x = M × y
60×25/30 = M×30/30
M = 60×25/30 = 6×25/3 = 2×25
M = 50g
PHYSICS OBJ AND ESSAY FOR WAEC 2020
Part ii b) A free falling object is an object that is falling under the sole influence of gravity. Any object that is being acted upon only by the force of gravity is said to be in a state of free fall. ... Free-falling objects do not encounter air resistance.
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.
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.
:
Pick two
Effects of refraction
I)An object appears to be raised when paced under water.
ii)Pool of water appears less deep than it actually is.
III)If a lemon is kept in a glass of water it appears to be bigger when viewed from the sides of glass.
ii)It is due to refraction of light that stars appear to twinkle at night.
A progressive wave is defined as the onward transmission of the vibratory motion of a body in an elastic medium from one particle to the successive particle.
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.
2a.A typical flat-plate collector is a metal box with a glass or plastic cover (called glazing) on top and a dark-colored absorber plate on the bottom. ... Sunlight passes through the glazing and strikes the absorber plate, which heats up, changing solar energy into heat energy.
Mutual Inductance is the interaction of one coils magnetic field on another coil as it induces a voltage in the adjacent coil
In the previous tutorial we saw that an inductor generates an induced emf within itself as a result of the changing magnetic field around its own turns.
12a
each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei, and hence differ in relative atomic mass but not in chemical properties; in particular, a radioactive form of an element.
12d. I) Fuel
Ii) Moderator
III) steam generator
Iv) Control rods
8bi) In Newtonian physics, free fall is any motion of a body where gravity is the only force acting upon it
[8/28, 9:45 AM] Aro Okeigbo Blog: 8bii) S=ut+½gt²
40=½10t²
40×2=10t²
t=√8
t=2.8sec
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(3a)
Material made from silica
(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.
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(2a)
A typical flat-plate collector is a metal box with a glass or plastic cover (called glazing) on top and a dark-colored absorber plate on the bottom. Sunlight passes through the glazing and strikes the absorber plate, which heats up, changing solar energy into heat energy.
(2b)
Insulation in thermal solar collectors prevents loss of accumulated heat in the solar collector and improves absorption efficiency.
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(8a)
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(8bi)
In Newtonian physics, free fall is any motion of a body where gravity is the only force acting upon it.
(8bii)
S=ut+½gt²
40=½10t²
40×2=10t²
t=√8
t=2.8sec
+++++++++++++++++++++++++++++++++
(10ai) Critical angle, in optics, the greatest angle at which a ray of light, travelling in one transparent medium, can strike the boundary between that medium and a second of lower refractive index without being totally reflected within the first medium.
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: (1)
Original length Lo = 3m
extension e = 3Lo = 3×3 = 9m
F ∝e
F = ke where k = 982.3Nm‐²
F = 982.3×9 = 8840.7N
The force that produces the extension F = 8840.7N
12aii
*Medicine*
- Sterilization of medical equipments
- Radiotherapy
🔌10b
*EFFECT OF REFRACTION*
i A swimming pools appears shallower when will look down into it than it is actually is
ii a partially immersed straight stick hit at an angle into water appears bent at the interface between the air and the water
iii a coin in a bull invisible to the observer becomes visible when is poured into the bowl
(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.
(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)
Progressive wave; is a wave which travels continuously in a medium in the same direction without the change in its amplitude
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