Waec physics answers 2022

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Waec physics answers 2022

Here is the 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.

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(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🇳🇬🇳🇬🇳🇬🇳🇬

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(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.

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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.

2 Comments

  1. odewole waliu June 15, 2022
  2. Scanty linear June 15, 2022

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