₦airaland Forum

Hmm! Interesting

jackpot:
scaredy cat.

My questions were merely Coordinate Geometry (can be found in Jamb Syllabus and Year 1 Elementary Maths II)

Golden ratio -jamb and elementary math?!! Abba, there's God o. Lol. It's all good though. At least one will learn new things

Nice one. I think we really need to analyse the level if questions that will be treated so as to know the category of participants. For instance, if the participants will include jambites/freshers, it might be unfair to them if 300/400 level questions for math students are used. I could remember miss Jackpot's wicked questions for the last edition(lol). So topics and questions should be selected based on general knowledge and basic mathematics. My own opinion though.

Bukkiminat:
I like your hand writing

lol, I like you for liking my hand-writing

As for me, I'll continue to lend a hand to who advocates for it in as much as it's within my power....

tobillionaire:
The first term of a G.p is equal to x-2, the third term is x+6 and the Arithmetic mean of d 1st nd 3rd term stands In d ratio to d 2nd as 5:3 , determine x

X = 3 or -7. Workings below

tobillionaire:
D sum of d 1st 9 terms of an A.P is 72 an d sum of d next 4 terms is 71, find d a

d = 3/2 a= 2.see workings below

tobillionaire:
Solve the equation 3a + 10 = a2 A. 5, 2 B. -5,
2 C.
10, 0 D. 5, -2 E. -5, -2
75. The common ratio of a geometrical
progression
is 2. if the 5th term is greater than the 1st term
by
45, find the 5th term. A. 3 B.6 C. 45 D. 48 E. 90

77. Evaluate log,025 + log,032 - Iog108 A. 0.2 B.
2 C.
100 D. 409 E. 490
---------------------- pls help

1. D
2. D
3. Question not clear
Check the attached picture for workings

nessie17:
it is possible oooo,

Ah! Possible bi ti bawo? I believe you know that perimeter is the sum of all the sides of a shape. So for a rectangle,
L + B + L + B = P (Perimeter)
2L + 2B = P
2(L + B) = P
L + B = P/2
Therefore, if perimeter of the rectangle is 30, then
L + B = 30/2 = 15
And B = 15 - L.

If you insist otherwise, try out this simple calculation.
If the length of a rectangle is x and breadth is 30 - x, calculate the perimeter of the rectangle.
See if you'll get 30 as your perimeter or not.

#Peace

nessie17:
this is from past question
Area=l*b, if the length is x then the breadth will be 30-x
Therefore Area=x(30-x)=30x-x^2
DA/dX=30-2x,at max da/dx=0,30-2x=0,
X=15,area =30(15)-15^2=225

Then they were absolutely wrong. The breadth cannot be 30 - x if the length is x and PERIMETER is 30. Just not possible!!!

nessie17:
Math question(differentiation)
30 meters of fencing wire is available to make a rectangular enclosure. Find the maximum possible area
A.450 B.225 C.675

The options are wrong. The maximum possible area is 56.25m^2.

From the question, perimeter is 30m
P = 2(l + b) = 30
l + b = 15;
l = 15 - b ______(i);
Therefore ;
Area = lb = (15-b)b
A = 15b - b²
dA/db = 15 - 2b
For area to be max, dA/db = 0
Therefore, 15 = 2b
b = 7.5
Sub. 7.5 for b in (i)
l = 15 - 7.5
l = 7.5
Therefore at max,
Area, lb = 7.5*7.5 = 56.25m^2

Seunvense:
I guess everyone has decided to stay glue to their books prior to the postume exam...The thread is going to be alive again after the postume.

You'll see people trooping in in large numbers when information about the post utme surfaces, not even after the exam...

It actually depends on the ROM and how you manage the battery! Check out my own screenshot in the picture below. Although I'm not a heavy user...

success254:
.sorry pls. no 1 =1/12, 3 no idea.

exactly, 6P3 (6 permutation 3) for number 3

success254:
,1= 1/18,2= 21yrs,3=?,4= 30deg.5=52

3/5. You missed number 1 and obviously number 3 try again

Why's this place so dry today na.
Ok, I'm gonna trick you out with cheap math questions.....

1. A die is tossed twice. What is the probability of obtaining a total of 6 if both numbers are odd?

2. The average age of 3 children in family is 9 years. If the average age of their parent is 39 years, what's the average age of the whole family?

3. How many 3-digit numbers can be formed using the integers 1 to 6 if no integer occurs twice in a number?

4. Find the angle in degree which the line x -√3y = 0 makes with the positive y-axis

5. If the equation 6 - kx + 2x^2 = 0 has equal roots, find k^2 + 4

thaotech:
Physics

1. 20
2. 44
3. D
4. 6
5. 1:3

yeah! You aced the questions, although you could have done better by adding the appropriate units to the answers....

Umartins1:
1.

10/100 * #400

= 1/10 * #400

= #40

#400-#40

= #360

Man==> 40/100 * #360

4 * #36

= #144


Together=

#40+#144

= #184



2. Possible outcome = 5+4+x

=9+x

X/ 9+x = 2/5

2(9+x) = 5x

18+2x= 5x

2x-5x= -18

-3x= -18

x= 6



3. Length = titre/360 * 2 pi r

6= titre/360 * 2 * 22/7 * 7

6= 44titre/360

44titre= 6*360

Titre= (6*360)/ 44

Titre = 49.09^o


Area = titre/360 * pi * r²

A= 49.09/360 * 22/7 * 7²

A = 49.09/360 * 22 /4 * 49

A= 21cm²




4. Y=2x² + 5x - 3

dy/dx= 4x+5

Sub for x

4(1)+5


= 9




5. No four-figure table, bro and my phone no get arcTan.

Weldone bro! Although it's theta and not titre, but then, who cares?
**winks**
Good Mawnin to y'all

horpeyemmi66:
*Physics
1. 30cm
2. 132cm
3. D
4. 0.954Hz
5. 1:3

What happened na? You only got 3 and 5, check them again bro

Romance-machine? I typed v-i-b-r-a-t-o-r and it's automatically changing it

Mathematics
1. A man and wife went to buy an article costing N400. the woman had 10% of the cost and the man 40% of the remainder. How much did they have altogether?

2. A bag contains 5 black, 4 white and x red marbles.
If the probability of picking a red marble is 2/5 find the value of x

3. A sector of a circle is bounded by two radii 7cm long and arc length 6cm. find the area of the sector.

4. Find the slope of the curve y = 2x^2 + 5x - 3 at (1,4)

5. If the shadow of a pole 7m high is ½ its length, what is the angle of elevation of the sun, correct to the nearest degree?

Physics:

1. What must be the distance between an object and a converging lens of focal length 20cm to produce an erect image two times the object height?

2. What is the wavelength of the first overtone of a note in a closed pipe of length 33cm?

3. The range of wavelengths of visible spectrum is 400nm – 700nm the wavelength of gamma rays is:
(A) Longer than 700nm
(B) shorter than 700nm but longer than 400nm
(C) 550nm
(D) shorter than 400nm
(E) infinite

4. In a ripple tank experiment, a vibrating plate is used to generate ripples in the water, if the distance between two successive troughs in 3.5cm and the wave travels a distance of 31.5cm in 1.5s, calculate the frequency of the vibrator

5. A tap supplies water at 26°C while another supplies water at 82°C. If a man wishes to bath with water at 40°C, what is the ratio of the mass of hot water to that of cold water?

horpeyemmi66:
At least more light has been shed by you...no offences taken though!

Thumbs up

horpeyemmi66:
Thanks for your cognisance @mathefaro.

During a phase change, latent heat is either giving off or absorbed without an increase or decrease in temperature, look at it this way viz:

Steam →Water →Ice (Latent heat is given off)
Ice →Water →Steam (Latent heat is absorbed/required).

The only thing that changes is the Volume of the substance (which in this case is water), mass remains the same.

When it changes from Solid through Liquid to Gas, it Volume decreases(it contracts) and the mass remains constant.

On the flip side, when water changes to Solid from Gas through liquid, its Volume increases(it expands) but the mass remains the same.

This occurence is clearly seen in the bursting of unlagged water pipes in temperate countries of the world.

In essence, the question only spoke about the change from Ice to Water(H= MC∆Θ, H=MLf). The question never stated any temperature rise in the question, as they know such, isn't feasible.

Albeit, temperature rises immediately before and after a phase change.

Post script: If we had been told the change was from Ice to steam, then one would have done something like this:
H= MLfi + MC∆Θw + MLv + MC∆Θ.
-----------------------------------------------------
Hope this answered your question?

Cc Pr0ton, Jolly94, enry54, PolyMath, mikechibuzor, OGOJNR, thaotech, Bhuumhite(winks*) et al.

Egba mi o!

You don't seem to get my point, infact, you didn't have to go through all the stress. What I meant was that, the effect of the supplied heat was not stated. Yes, you're right about the fact that since a temperature change wasn't involved/ stated in the question, then it should be latent heat-related, but then, the heat supplied might not be enough to completely melt the 30g of ice. And since calculation can't be made on mere assumptions, I feel that little detail must be added for clarity sake.
However, if you think otherwise, I rest my case and it's all good. There's no point creating an argument over it.
#Shalom

horpeyemmi66:
What's implicit in the question??...Do underscore it.

Ok! You forgot to mention the effect of the heat supplied. If it just melted the ice completely or raised raised the temperature by some degrees as in:

80% of the heat supplied to a block of ice at 0°C completely melts 30g of ice. Calculate the total heat energy supplied. (Specific latent heat of Ice= 336J/g)

as opposed to this:

80% of the heat supplied to a 30g block of ice at 0°C. Calculate the total heat energy supplied. (Specific latent heat of Ice= 336J/g)

horpeyemmi66:
*PHYSICS | LATENT HEAT 001

5. 80% of the heat supplied to a 30g block of ice at 0°C. Calculate the total heat energy supplied. (Specific latent heat of Ice= 336J/g)

Please modify, incomplete question. Although most people got the message you're trying to pass across.....

Like I said earlier, utme and post utme have a scope. I can also tell you that there are lots of things we can teach one another on here, trust me. We all have questions that may pose problems for O'level candidates but that wouldn't help the cause of aspirants here.

I rest my case here
#Peace

It's getting hotter in here, mehn! UI is in big trouble.

enry54:
Na Jamb Questions! Based on the syllabus

If I hear! I can say it with all authority that jamb will never set such question and neither will any school for PUTME. Because like I said earlier, it's beyond the scope of UTME even if as you put it, it's in the syllabus. For the fact that the topic is part of the syllabus doesn't mean they have to go deep to this level. For instance, when you check the math syllabus, you have calculus in it but there is a limit to which they can go in calculus questions (scope). Nevertheless, I believe horpeyemmi66 has done a good job up there. That should be the correct answer if I'm not mistaken.

Good morning to y'all

enry54:
PHYSICS Que. Please Don't Ignore!!!

1. A missile weighing 400N on the earth's surface is shot into the atmosphere to an altitude of 6.40 x 10^6m, taking the earth as a sphere of radius 6.40 x 10^6m. What would be the weight of the missile at that altitude?

2. Assuming that the mean density of the earth is 5500kg/m^3, that the constant of gravitation is 6.7 x 10^-11 and that the radius of the earth is 6400km. Find a value for the acceleration due to gravity at the earth's surface.

3. What would happen to the earth's period of revolution if its mass was three times as great as it is?

For candidates preparing for post utme? Way off the scope IMO

A very cheap math question to start the day.

The lengths of the minor and major arcs of a circle are 54 cm and 126 cm respectively.Calculate the angle of the major sector.

Good morning guys. Wish y'all a stress-free day

Anyway, if my assumptions are correct, then the internal resistance, r = R/2. See picture below

OGOJNR:
itz in the questn nw,try to read the questn again

I mean the question is not well structured..... I don't want to work on assumptions.