Waec physics answers 2022

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Waec physics answers

PHYSICS OBJ

1-10: BCABBDDACA

11-20: CABCBDBDBD

21-30: ABCCBBAADA

31-40: BCDBCBACDA

41-50: DACBDDDBAA

Completed.

(8ai)
The law of inertia states that a body will continue in its present state of rest or if it is in motion, will continue to move with uniform speed in a straight line unless it is acted upon by a force.

(8aii)
When the brakes of the moving vehicle are suddenly applied, or the passengers jerks forward as thet tend to continue in a straight line. The seat belt helps to provide a backward force and reduces injuries.

(8bi)
The moment of a force about a fixed point is the product of the force and the perpendicular distance at the point to the line of action of the force.

(8bii)
(I) Draw the Diagram
[img]https://i.ibb.co/WVpD5FX/IMG-20220615-WA0247.jpg[/img]

(II) clock wise moment = Anticlock wise moment
T x 1.5 = 54 x 0.5
T = 54×0.5/1.5
T = 18N

(III) F + T = w
F = w – T
F = 54 – 8
F = 36N

(8c)
[TABULATE]

=STATIC FRICTION=
(i) Acts whete the surfacrs are at rest
(ii) It had ahighet coefficient value
(iii) Increases linearly wuth the applied force untill it reaches a maximum value.

=DYNAMIC FRICTION=
(i) Acts where the surfaces have relative motion
(ii) Has a lower coefficient value
(iii) Remains constant regardless of the force applied.

(8d)
By increasing the number of pulleys.

(1)

Range|PQ| = U²Sin2Θ/g

Where U = 250ms-¹, Θ= 42°

= 250²×Sin(2×42°)/10

= 62,500×Sin84°/10

= 6250×0.9945

= 6215.63m

(4)

Given;

F=50N, K=100N/m

But,

F= k.e

Therefore, 50=100 x extension(e)

e= 50/100

= 0.5m

But,

Workdone = 1/2(F x e)

=1/2(50 x 0.5)

=1/2(25)

=12.5Nm

11b
Latent heat (also known as latent energy or heat of transformation) is energy released or absorbed, by a body or a thermodynamic system, during a constant-temperature process — usually a first-order phase transition.

Latent heat can be understood as energy in hidden form which is supplied or extracted to change the state of a substance without changing its temperature. Examples are latent heat of fusion and latent heat of vaporization involved in phase changes, i.e. a substance condensing or vaporizing at a specified temperature and pressure????????

(2)??????
– They are pure semiconductors with impurities less than 1 and have tetravalent crystals.
– Presence of mobile charge carriers is intrinsic property of material.
– No dopping or addition of impurities required.

(2)

– They are pure semiconductors with impurities less than 1 and have tetravalent crystals.

– Presence of mobile charge carriers is intrinsic property of material.

– No dopping or addition of impurities required.

(5a)

A geostationary satellite is an earth-orbiting satellite, placed at an altitude of approximately 35,800 kilometers (22,300 miles) directly over the equator, that revolves in the same direction the earth rotates (west to east).

(5b)

– Gas Lasers

– Solid-State Lasers.

– Fiber Lasers

NUMBER (7)

MAGNETIC MATERIAL

1. Magnetic materials are materials that a magnet will attract to itself when placed near a magnet (or when placed in its field).

NON MAGNETIC MATERIAL

1. Non-magnetic materials that will not experience any magnetic force when placed near a magnet, in other words, it will not be attracted to the magnet.

MAGNETIC MATERIAL

2. The magnetic state of magnetic materials are aligned either parallel or antiparallel arrangements hence they can respond to a magnetic field when they are under the influence of an external magnetic field.

NON MAGNETIC MATERIAL

2. The magnetic state of non-magnetic materials are arranged in a random manner in such a way that the magnetic movements of these domains are cancelled out. Hence, they do not respond to a magnetic field.

MAGNET MATERIAL

3. Magnetic materials are used to make permanent magnets, as it can be magnetised by a magnet.

NON MAGNET MATERIAL

3. Non-magnetic materials can never be magnetised by a magnet therefore, it can never become a magnetised material.