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2016 NAIRALAND JAMB TUTORIAL {the Physics Thread } - Education (2) - Nairaland

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Re: 2016 NAIRALAND JAMB TUTORIAL {the Physics Thread } by thankyouJesus(m): 6:39pm On Dec 20, 2015
thankyouJesus:
[b]Classwork.
1. A wire of length 5m and diameter 2mm extends by 0.25mm when a force of 50N was used to stretch it from its end. Calculate (a) strain (b) stress in the wire. (Hint; unit and area of circle).
[quote author=Slimbeth post=41178897]Strain 5*10~-5 stress 15.9*10~6
l=5m,
r=d/2=2mm/2=1mm=0.001m,
e=0.25mm=0.00025m,
f=50N.
Area of circle=pi X r2.
A=3.142X10-6m2.
Stress=F/A
s=50/(3.142X10-6,
s=1.591X107N/m2. Very good, please always endeavour to show workings for benefit of others.
Re: 2016 NAIRALAND JAMB TUTORIAL {the Physics Thread } by thankyouJesus(m): 6:45pm On Dec 20, 2015
Slimbeth:
2. 1.25m 3. 1498.5J am not sure of no.3 cc.thankyoujesus
2. 12.5cm = 0.125m.
Re: 2016 NAIRALAND JAMB TUTORIAL {the Physics Thread } by Oxytocin(m): 6:53pm On Dec 20, 2015
Hmmm..... Nice thread, keep it guyz! Kudos thankyouJesus smiley
2.12.5cm
3.1.35Joules
I don't have a pen to solve no1
BTW.. Youngs modulus does not have a unit as you've written up there^^


On the other hand, am creating a WhatsApp group, for chemistry, physics, biology and maths.. Anyone interested should drop his/her number wink.
Re: 2016 NAIRALAND JAMB TUTORIAL {the Physics Thread } by thankyouJesus(m): 6:54pm On Dec 20, 2015
Slimbeth:
2. 1.25m 3. 1498.5J am not sure of no.3 cc.thankyoujesus
k=1500N/m.
F=45N.
K=F/e,
e=0.03m.
PE=mgh
PE=Fh=Fe. You are good to go. Kudos to you, nice work.
Re: 2016 NAIRALAND JAMB TUTORIAL {the Physics Thread } by thankyouJesus(m): 7:01pm On Dec 20, 2015
Oxytocin:
Hmmm..... Nice thread, keep it guyz! Kudos thankyouJesus smiley
2.12.5cm
3.1.35Joules
I don't have a pen to solve no1
BTW.. Youngs modulus does not have a unit as you've written up there^^


On the other hand, am creating a WhatsApp group, for chemistry, physics, biology and maths.. Anyone interested should drop his/her number wink.
Thank you sir.
Using dimensional analysis,
young modulus =stress/strain
E=fl/ae
E=Nm/m^2m
E=N/m^2.
Great job on the solution.
Re: 2016 NAIRALAND JAMB TUTORIAL {the Physics Thread } by Oxytocin(m): 7:30pm On Dec 20, 2015
thankyouJesus:
Thank you sir.
Using dimensional analysis,
young modulus =stress/strain
E=fl/ae
E=Nm/m^2m
E=N/m^2.
Great job on the solution.
Yea, buh tensile stress is regarded as a single unit likewise strain... Thanks for the analysis anyways.
BTW... Am not a 'sir', an aspirant here wink
Re: 2016 NAIRALAND JAMB TUTORIAL {the Physics Thread } by thankyouJesus(m): 7:56pm On Dec 20, 2015
Oxytocin:

Yea, buh tensile stress is regarded as a single unit likewise strain... Thanks for the analysis anyways.
BTW... Am not a 'sir', an aspirant here wink
thankyouJesus:
[b]Strength of Material.
1. Tensile/Compressive stress; This is the ratio of load/force to its area. It is measured in N/m2.
Mathematically;
Stress = force/area.
2. Tensile/Compressive strain; Is the ratio of extension to original length. It has no unit.
Mathematically;
Strain = extension/length.
3. Young modules; This is the ratio of stress to strain. It is denoted by E and measured in N/m2.
Mathematically;
E = stress/strain = (F/A) / (E/L)
E = (F/A) X (L/E) = FL/AE.
Re: 2016 NAIRALAND JAMB TUTORIAL {the Physics Thread } by thankyouJesus(m): 8:12am On Dec 21, 2015
Good morning all, I was impressed by the solution provided by you guys, keep it. God will water your bread.
Work.
In ordinary meaning, work refers to any kind of physical or mental activity. But in physics, work is always associated with movement. Thus, work is said to be done if a force applied makes the object to move a distance in the direction of the applied force.
Work is defined as the product of force and perpendicular distance in the direction of the applied force. It is denoted by w, measured in Joule and a scaler quantity.
Mathematically;
work = force X distance
w = f X s
since, force = mass X acceleration
work = m X a X s.

Example; A crane lifts a load of 2kg very slowly through a vertical distance of 100cm. Calculate the workdone against gravity if g = 10m/s2.
Solution;
load=2kg
s=100cm=1m
a=g=10m/s2.
Workdone=F X S
w=mas
w=2 X 10 X 1
w=20J.

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Re: 2016 NAIRALAND JAMB TUTORIAL {the Physics Thread } by thankyouJesus(m): 8:45am On Dec 21, 2015
[b]Energy.
Energy is the capability or ability to do or perform work. It is denoted by E measured in Joule and a scaler quantity.
Forms of Energy.
1. Mechanical energy.
2. Electrical energy.
3. Heat energy.
4. Chemical energy.
5. Solar/light energy.
6. Nuclear/atomic energy.
7. Sound energy.
Conservation of Energy.
The principle of the conservation of energy states that, "in a closed system, energy can neither be created nor destroyed during transformation".
Mechanical Energy.
Mechanical energy is a form of energy which is generally used in daily activities by individuals and objects eg moving vehicles, mountain climbing etc.
They are of two types;
1. Kinetic energy;It is defined as the energy due to motion. It is denoted by KE or EK, measured in Joule and it is a scaler quantity.
Mathematically;
KE=(1/2)mv2.
Where m is mass(kg)
v is velocity(m/s)
Application of KE.
1. Wind mills.
2. Moving bullet.
2. Potential energy; Potential energy is defined as the energy at rest. It is denoted by PE or EP, measured in Joule and a scaler quantity.
Mathematically;
PE=mgh.
Where m is mass(kg)
g is acceleration due to gravity(m/s2)
h is height(m).
Application of mechanical energy.
1. Movement of objects.
2. Working system of pendulum clock.
3. Construction of dam for the generation of electricity.

Example; A fruit from a tree of mass 2kg is 5m above the ground. Calculate the PE of the fruit above the ground. (g=10m/s2).
Solution;
m=2kg
h=5m
g=10m/s2.
PE=mgh
PE=2 X 10 X 5
PE=100J.[/b]

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Re: 2016 NAIRALAND JAMB TUTORIAL {the Physics Thread } by thankyouJesus(m): 9:03am On Dec 21, 2015
Power.
Power is the rate of workdone or the rate at which energy is expended. It is denoted by P, measured in Watt and it is a scaler quantity. The instrument for measurement is wattmeter.
Mathematically;
Power = workdone/time
P = (F X S) / T
recall that V = S/T
P = FV.
Where p is power(watt)
f is force(N)
s is distance(m)
t is time(second)
v is velocity(m/s).

Example; A girl whose mass is 40kg walks up a flight of 20steps each in 150mm height in 10sec. Find the average power developed (g=10m/s2).
Solution;
m=40kg
h=(20 X 150mm)=3m
t=10sec.
Power = 120W.

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Re: 2016 NAIRALAND JAMB TUTORIAL {the Physics Thread } by thankyouJesus(m): 9:47am On Dec 21, 2015
Classwork.
1. A stone of mass 750g is thrown vertically upwards with a velocity of 10m/s. Find (a) PE at the greatest height (b) KE on reaching the ground (g=10m/s2. Hint; equation of motion.
2. A ball of mass 1000g is dropped from a height of 5m and rebounded to a height of 25m.d. Calculate (a) KE just before impact (b) its initial rebound velocity and KE. Hint; equation of motion.
3. A body of mass 10kg is acted upon by a constant force of 30N for 2sec. Calculate the KE gained by the body. Hint; F = ma.
Cc; oxytocin slimbeth debbychris geofavor
Re: 2016 NAIRALAND JAMB TUTORIAL {the Physics Thread } by iceberryose(m): 11:40am On Dec 21, 2015
Sir pls solve 1 and 2 here's my number 3 not sure tho m=10kg f=30N t=2seconds
KE=1/2MV^2 recall that f=ma 30=10a a=3
a=v x t 3=v x 2 3=2v v=1.5 back to the formula KE=1/2 x 10 x 1.5^2 KE=1/2 x 10 x 2.25 KE=11.25joules
Re: 2016 NAIRALAND JAMB TUTORIAL {the Physics Thread } by DebbyChris(f): 11:51am On Dec 21, 2015
1a.75J (b)37.5J 2a.50J (b)? 3.180J pls solve it lets see.
Re: 2016 NAIRALAND JAMB TUTORIAL {the Physics Thread } by thankyouJesus(m): 6:54am On Dec 22, 2015
iceberryose:
Sir pls solve 1 and 2 here's my number 3 not sure tho m=10kg f=30N t=2seconds
KE=1/2MV^2 recall that f=ma 30=10a a=3
a=v x t 3=v x 2 3=2v v=1.5 back to the formula KE=1/2 x 10 x 1.5^2 KE=1/2 x 10 x 2.25 KE=11.25joules
Kudos and nice job.
Re: 2016 NAIRALAND JAMB TUTORIAL {the Physics Thread } by thankyouJesus(m): 6:55am On Dec 22, 2015
DebbyChris:
1a.75J (b)37.5J 2a.50J (b)? 3.180J pls solve it lets see.
great work.
Re: 2016 NAIRALAND JAMB TUTORIAL {the Physics Thread } by thankyouJesus(m): 7:06am On Dec 22, 2015
thankyouJesus:
Classwork.
1. A stone of mass 750g is thrown vertically upwards with a velocity of 10m/s. Find (a) PE at the greatest height (b) KE on reaching the ground (g=10m/s2. Hint; equation of motion.
mass=750g=0.75kg,
a=-g=-10m/s2 (against gravity),
u=10m/s.
(a) PE at the greatest height,
v=0m/s,
s=h=?.
Using equation of motion,
v2 = u2 + 2as.
H = S = 5m.
PE = mgh.
(b) KE on reaching the ground,
u=0m/s,
h = s = 5m
a = 10m/s2 (motion under gravity),
v=?.
Using equation of motion same as above,
v = 10m/s.
KE=(1/2)mv2

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Re: 2016 NAIRALAND JAMB TUTORIAL {the Physics Thread } by thankyouJesus(m): 7:21am On Dec 22, 2015
thankyouJesus:
2. A ball of mass 1000g is dropped from a height of 5m and rebounded to a height of 25m.d. Calculate (a) KE just before impact (b) its initial rebound velocity and KE. Hint; equation of motion.
m=1000g=1kg,
u=0m/s (dropped from a height),
a=g=10m/s2
h=s=5m.
(a)KE just before impact, using equation of motion same as 1,
v=10m/s.
KE=(1/2)mv2.
(b)its initial velocity.
At the greatest height (25m), v=0m/s,
h=s=25m,
a=-g (motion against gravity),
u=?.
Use equation of motion above.
Re: 2016 NAIRALAND JAMB TUTORIAL {the Physics Thread } by thankyouJesus(m): 7:33am On Dec 22, 2015
thankyouJesus:
3. A body of mass 10kg is acted upon by a constant force of 30N for 2sec. Calculate the KE gained by the body. Hint; F = ma.
m=10kg,
f=30N,
t=2sec.
Using F=ma,
a=3m/s2.
Recall that,
a=v/t,
v=6m/s.
KE=(1/2)mv2
Re: 2016 NAIRALAND JAMB TUTORIAL {the Physics Thread } by thankyouJesus(m): 8:16am On Dec 22, 2015
[b]Good morning all, great job DebbyChris and Iceberryose, I am proud of you both. Due to my tight schedule this week, I may not be able to upload much on this thread. Taking into cognizance the aforementioned opine, I will try as much as possible to update "something".
Position.
Position of a point is the distant between two perpendicular lines. The lines are called x-axis and y-axis and their intersection is called the origin. The x-axis is called the x-co-ordinate or the abscissa and the y-axis is called the y-co-ordinate or the ordinate. The abscissa is written next to the ordinate, eg A(x,y), B(3,5) etc.
Scaler and Vector Quantities.
Scaler; A quantity that has only a magnitude but no direction eg length, area, volume, mass, speed, energy, distant, etc.
Vector; Quantity which has both a magnitude and a direction eg force, velocity, displacement, momentum, acceleration etc.
The magnitude is shown by the length and the direction by the arrow representing the position or direction. The resultant of a scaler quantity is simply added algebraically while for vector, Pythagora's law, polygon's law and parallelogram's law are used.[/b]

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Re: 2016 NAIRALAND JAMB TUTORIAL {the Physics Thread } by Geofavor(m): 8:37am On Dec 22, 2015
NL mentions, though.
Re: 2016 NAIRALAND JAMB TUTORIAL {the Physics Thread } by Oxytocin(m): 8:09pm On Dec 22, 2015
Nice one.. ThankyouJesus smiley

1 Like

Re: 2016 NAIRALAND JAMB TUTORIAL {the Physics Thread } by thankyouJesus(m): 8:24am On Dec 23, 2015
Good morning all, how was the night?
Heat Transfer.
Heat can be transferred from one point to another in three media. These are solid, liquid and gas. Process of heat transfers in each medium are conduction, convention and radiation.
Conduction.
Conduction is the transfer of heat through a material from one place to another, by the vibration or motion of the molecules of the material.
Most metals that allow heat to pass through them are said to be good conductors of heat. Non-metals such as wood, cork do not allow heat to pass through them are said to be poor conductors.
Most liquids are poor conductors but there are some metals in liquid form which are good conductors eg Ag, Hg etc.
Re: 2016 NAIRALAND JAMB TUTORIAL {the Physics Thread } by thankyouJesus(m): 8:34am On Dec 23, 2015
Convection.
Convection occurs in fluids eg gases and liquid. It is the process by which heat energy is transferred in a fluid by the actual movement of the heated fluid.
Convectional Current.
Convectional current is a characteristic exhibited by the heated fluid which involves the transfer of the heat energy from the hot region to the cold region so as to have a uniform distribution.
Convection in Gases.
Convection in gas is very common and the gas expands more than liquid when subjected to high temperature.
Re: 2016 NAIRALAND JAMB TUTORIAL {the Physics Thread } by thankyouJesus(m): 8:59am On Dec 23, 2015
[b]Radiation.
Radiation is the last mode of heat transfer. It differs from other mode of heat transfer because it requires no material medium. The Sun emits its rays from the sky down to the Earth without any material medium i.e. through empty space.
Radiation can be defined as the process by which heat energy is transferred from one point to another without heating the intervening medium.
Radiation gives off a form of energy which is called radiant energy e.g. the emission of rays from the Sun. Radiant heat can be detected/measured using Leslie cube or thermopile.
Note; Polished surface reflects heat, black surface absorb heat.
Vacuum/Thermo Flask.
The vacuum flask is used to keep the temperature or quality of its content constant.
The flask regulation undergoes three main processes;
1. Cork; This helps to reduce heat loss by conduction.
2. Vacuum; This helps to reduce heat loss by convection and conduction, since they are both require material medium.
3. Silver wall; It reduces heat loss by radiation, since silver is a polished surface and can reflect heat.[/b]

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Re: 2016 NAIRALAND JAMB TUTORIAL {the Physics Thread } by thankyouJesus(m): 9:06am On Dec 23, 2015
Assignment.
Write short note on with examples where necessary (a) conductor (b) insulator (c) semi-conductor
cc; Debbychris Iceberryose Oxytocin Geofavor
Re: 2016 NAIRALAND JAMB TUTORIAL {the Physics Thread } by DebbyChris(f): 9:29am On Dec 23, 2015
a) conductors are material that allow the flow of electric current through them.eg metals, earth etc
b) insulators are material that do not allow the flow of electric current through them.eg paper, sulphur, glass, oil etc

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Re: 2016 NAIRALAND JAMB TUTORIAL {the Physics Thread } by DebbyChris(f): 9:32am On Dec 23, 2015
Semiconductors are materials which have an electric conductivity intermediate in value btw that of a good conductor and a good insulator. eg silicon

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Re: 2016 NAIRALAND JAMB TUTORIAL {the Physics Thread } by iceberryose(m): 10:53am On Dec 23, 2015
SECOND TO SUBMIT

CONDUCTORS- These are materials that allows charges to pass through them easily. Conductors have little resistance[i.e opposition to movement of charges] . Examples of conductors are copper,aluminium, iron,gold.


INSULATORS- These are materials that does not alloy charges to pass throug them. They have very high resistance e.g clay,porcelain,aluminal,polyethylene


SEMI-CONDUCTORS- These are seen as a borderline between insulators and conductors. A semi conductor allow charge to pass through it partially. On heating of a semiconductor, it's conductivity increases e.g silicon

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Re: 2016 NAIRALAND JAMB TUTORIAL {the Physics Thread } by thankyouJesus(m): 8:10am On Dec 24, 2015
DebbyChris:
a) conductors are material that allow the flow of electric current or heat through them.eg metals, earth etc
b) insulators are material that do not allow the flow of electric current or heat through them.eg paper, sulphur, glass, oil etc
Great job, look out for the coloured words.
Re: 2016 NAIRALAND JAMB TUTORIAL {the Physics Thread } by thankyouJesus(m): 8:14am On Dec 24, 2015
iceberryose:
SECOND TO SUBMIT

CONDUCTORS- These are materials that allows charges or heat to pass through them easily. Conductors have little resistance[i.e opposition to movement of charges] . Examples of conductors are copper,aluminium, iron,gold.


INSULATORS- These are materials that does not alloy charges or heat to pass throug them. They have very high resistance e.g clay,porcelain,aluminal,polyethylene


SEMI-CONDUCTORS- These are seen as a borderline between insulators and conductors. A semi conductor allow charge to pass through it partially. On heating of a semiconductor, it's conductivity increases e.g silicon
Nicely done, watch out for words in colour.
Re: 2016 NAIRALAND JAMB TUTORIAL {the Physics Thread } by iceberryose(m): 8:17am On Dec 24, 2015
Sir when's our next class? Jamb is fast approaching sir
Re: 2016 NAIRALAND JAMB TUTORIAL {the Physics Thread } by thankyouJesus(m): 8:27am On Dec 24, 2015
Good morning all, note the following standard notations in physics. 1. T = 1012. 2. G = 109. 3. M = 106. 4. K = 103. 5. m = 10-3. 6. u = 10-6. 7. n = 10-9. 8. p = 10-12. 9. f = 10-15. Example; If a force of 20KN was used to .................. Solution; F = 20KN = 20 X 103N.c. F = 20000N.

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