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Re: Jamb Lecture/past Questions For Science/art Students by mathefaro(m): 8:49pm On Oct 06, 2014 |
Segipaul:The work needed to stop the bullet = energy possessed by the moving bullet(kinetic energy) M = 20/1000 = 1/50kg (converted the g to kg) V = 150m/s K.E = ½mv2 => ½*1/50*150*150 = 225J m = 10kg; g = 10m/s2, © = 30o(let theta = ©); Reaction force, R = mgCos©; => R = 10*10*Cos30 => R = 100*0.866 => R =86.6N Battery low o!! I'll continue later |
Re: Jamb Lecture/past Questions For Science/art Students by Benjaminbest(m): 9:01pm On Oct 06, 2014 |
#a lens of focal length 12cm form an upright image three times d size of a real object. D distance between d object and d image is. #a load of 5N gives an extention of O.56cm in d wire which obeys hooke law. What is d extention cause by a load of 20N |
Re: Jamb Lecture/past Questions For Science/art Students by mathefaro(m): 9:25pm On Oct 06, 2014 |
Segipaul:m = 5kg; a = 0.1m/s2; horizontal force = 10N Frictional force, F = ? Accelerating force f = ma = 5*0.1 = 0.5N Frictional force = Horizontal force - accelerating force F = 10 - 0.5 = 9.5N Reaction force, R = mg => 5*10 = 50N Therefore, the coefficient of friction, U = F/R => 9.5/50 = 0.19 It has no unit |
Re: Jamb Lecture/past Questions For Science/art Students by mathefaro(m): 9:41pm On Oct 06, 2014 |
Benjaminbest:f=12cm; v = 3u Using the mirror formula, 1/f = 1/u + 1/v; 1/12 = 1/3u + 1/u multiplying through by 12u (l.c.m.), we have 12u(1/12) = 12u(1/3u) + 12u(1/u) u = 4 + 12 u = 16 Therefore v = 3*16 = 48 Therefore, the distance between the object and image = v + u = 48 - 16= 32cm #a load of 5N gives an extention of O.56cm in d wire which obeys hooke law. What is d extention cause by a load of 20N According to Hooke's law, f = ke F1 = 5N, e1 = 0.56cm, f2 = 20N, e2 = ? F1/e1 = f2/e2 5/0.56 = 20/ e2 e2 = 4*0.56 = 2.24cm |
Re: Jamb Lecture/past Questions For Science/art Students by Benjaminbest(m): 6:34am On Oct 07, 2014 |
try again |
Re: Jamb Lecture/past Questions For Science/art Students by Benjaminbest(m): 6:57am On Oct 07, 2014 |
physics.......as a physicist if u are not good with unit it is easy for u to b thrown off balance in physics we have two physical quantity which are fundamental and derived unit. Fundamental unit are unit which can not broken down because dey occur in a single form e.g fundamental unit unit name/abbrev Length metre m time second s temperature kelvin k luminous intensity candela cd mass kilogramme kg cureent ampere A we also have derive a combination of fundamental unit e.g derived unit unit name abbrev velocity metre persec ms-1 force newton N density kilograme cubicmetre kgm-3 potential difference volt v acceleration mete persec square charge coloumb Q resistance ohm inductance henry H capacitance farad f magnetic field tesla T magnetic flux weber w |
Re: Jamb Lecture/past Questions For Science/art Students by Benjaminbest(m): 7:20am On Oct 07, 2014 |
i no dis is very short but am kind of busy ryt na update resume later |
Re: Jamb Lecture/past Questions For Science/art Students by igstars(f): 7:48am On Oct 07, 2014 |
#a load of 5N gives an extention of O.56cm in d wire which obeys hooke law. What is d extention cause by a load of 20N[/quote] lemme try... hooke's law states, F=ke. when F=5N, e=0.56, k=? F=ke, k=F/e 5/0.56=k k=8.92...... so when F=20. k=8.92, e=? F/k=e 20/8.92=2.24cm... pls correct me if am wrong.... |
Re: Jamb Lecture/past Questions For Science/art Students by Benjaminbest(m): 7:55am On Oct 07, 2014 |
i first question is wrong not d second one so answer d first |
Re: Jamb Lecture/past Questions For Science/art Students by mathefaro(m): 8:25am On Oct 07, 2014 |
Benjaminbest:what does this mean, that I'm wrong? I'm anxiously waiting for your correction......Albeit the post |
Re: Jamb Lecture/past Questions For Science/art Students by Benjaminbest(m): 8:59am On Oct 07, 2014 |
mathefaro:no doubt d second question u got it ryt but d first is wrong |
Re: Jamb Lecture/past Questions For Science/art Students by Destilo(f): 9:17am On Oct 07, 2014 |
Benjaminbest: @Benjamin let's know where he got it wrong.... we are here to learn |
Re: Jamb Lecture/past Questions For Science/art Students by Destilo(f): 9:21am On Oct 07, 2014 |
@Mathefaro...n other maths expert in d house... Help me solve this: 1. The first term of an AP is 3 and the eleventh term is 18. Find the number of terms in the progression if the sum is 81. thank u |
Re: Jamb Lecture/past Questions For Science/art Students by mathefaro(m): 9:52am On Oct 07, 2014 |
Destilo:a = 3, T11 = 18; Sn = 81, n = ? For an arithmetic progression, A.P, Tn = a + (n - 1)d Hence,T11 = a + 10d = 18 And since a = 3, 3 + 10d = 18 10d = 15 d = 3/2 = 1.5 Also, for an A.P, Sn = (n[2a + (n - 1)d])/2, Hence Sn = (n[2a + (n - 1)d])/2 = 81 Recall that a = 3 and d = 1.5 Therefore Sn = (n[2*3 + (n - 1)1.5])/2 =81 Cross multiplying gives: n(6 + 1.5n - 1.5) = 162 => n(1.5n + 4.5) = 162 => 1.5n2 + 4.5n - 162 = 0 => use any suitable method to solve the quadratic equation to get n as 9, the other value is negative(-12) and will be discarded since n cannot be negative |
Re: Jamb Lecture/past Questions For Science/art Students by mathefaro(m): 9:55am On Oct 07, 2014 |
Benjaminbest:Since you think it's wrong, I'm very eager to see the right solution boss. |
Re: Jamb Lecture/past Questions For Science/art Students by Benjaminbest(m): 12:37pm On Oct 07, 2014 |
i got d question from jamb past questions after solving it i notice dat my answer is not even among d options provided same so i tink dey are wrong because dey said d answer is 32..... First d image is real dat makes it positive second we are not solving for d object distance alone 1_ =1_ + 1_ 12 3u u d l.c.m is 3u 1_=1___+3 =48_ =16 12 3u 3 mag=v_ u 3*16=48 is d distance between both of dem 48-16=32 |
Re: Jamb Lecture/past Questions For Science/art Students by Benjaminbest(m): 12:39pm On Oct 07, 2014 |
lemme no if u are not clear |
Re: Jamb Lecture/past Questions For Science/art Students by Benjaminbest(m): 12:58pm On Oct 07, 2014 |
mathefaro:guy u are good dat is d truth but u have to see boyond d question dat is given before solving it |
Re: Jamb Lecture/past Questions For Science/art Students by Benjaminbest(m): 1:17pm On Oct 07, 2014 |
lets deliberate on d topic density after den we will answer few question.....so guys what idea do u have on dis topic |
Re: Jamb Lecture/past Questions For Science/art Students by mathefaro(m): 1:29pm On Oct 07, 2014 |
Benjaminbest:You still haven't told me where I got it wrong o, you got 32cm like I did after modifying your post, does that mean also wrong? (The only mistake I can see in my solution is typographic "+" instead of "-" which didn't affect my actual computations) BTW, compare the solution you gave to mine and tell me which is more confusing and which is more explanatory. And would you mind giving us a diagram to buttress your explanation? I think that will throw more light to this...... |
Re: Jamb Lecture/past Questions For Science/art Students by Benjaminbest(m): 1:46pm On Oct 07, 2014 |
mathefaro:before solving such question u must understand d image given and d lens use.....lets not make dis an issue iam waiting for ur explanation on density |
Re: Jamb Lecture/past Questions For Science/art Students by mathefaro(m): 2:33pm On Oct 07, 2014 |
Benjaminbest:I'm not making it an issue here, you said I'm wrong and made it look as if I didn't know what I was doing at all and that's why I'm asking you to point out my mistake because I was and am SURE that my solution is very correct. Anyway, that's bygone, I'll give my contribution on density when I'm through with these classes ahead of me to take. #peace |
Re: Jamb Lecture/past Questions For Science/art Students by chimhigher(m): 2:52pm On Oct 07, 2014 |
Benjaminbest: Benjaminbest:Benjaminbest..Mathefaro z Ryt...I/f= 1/u+1/v= 1/12=1/u+1/3u....... solving d Fraction 1/u+1/3u=4/3u....therefore...12=4/3U...mkin u subject f formulae we hve U= 16...nd V= 3U..3*16=48...so d diatance btwen image nd object is 48-16=32cm |
Re: Jamb Lecture/past Questions For Science/art Students by Benjaminbest(m): 3:01pm On Oct 07, 2014 |
a simple pendulum with a period of 2.0 has it length doubled. It new period is? If d relative density of a mental is 19 what will b d mass of 20cm of d metal wen immersed in water? If d fundamental frequency of a closed pipe organ on a day when d speed of sound is 340ms-1 is 170hz then d length of d pipe is? A man walk 8km north and then 5km in a direction 60 degree east of north. Find d distance from his starting point? A household refrigerator is rated 200watts. If electricity cost 5k perkwh, what is d cost of operating it for 20days |
Re: Jamb Lecture/past Questions For Science/art Students by Benjaminbest(m): 3:03pm On Oct 07, 2014 |
dis is jst a little stress compare to what will b posted on dis thread two months to exam |
Re: Jamb Lecture/past Questions For Science/art Students by Benjaminbest(m): 3:07pm On Oct 07, 2014 |
tomoro is for chemistry....i will try to post more dan 10 questions tomoro on chemistry |
Re: Jamb Lecture/past Questions For Science/art Students by Benjaminbest(m): 3:21pm On Oct 07, 2014 |
iam providing new time table for d sake of our art student Monday....................mathematics/current affair tuesday...................physics/government wednesday.......chemistry/c.r.s thursday........biology/agric friday..............english/economics saturday......general questions sunday.......general discussion about exams hope am not leaving anytin out? Alryt! So guys we will have a general test on october 26 thanks and keep following! |
Re: Jamb Lecture/past Questions For Science/art Students by chimhigher(m): 3:41pm On Oct 07, 2014 |
Benjaminbest:.....4 no 3..at fundamental,D lenght of a closed pipe is wavelenght/4= ^/4... but recall velocity= frequency * wavelenght..mkin wavelenght subject f Formula its 340/170= 2metres... so bak 2 our closed pipe formula...Lenght=^/4.. so lenght is 2/4 = 1/2 or 0.5m |
Re: Jamb Lecture/past Questions For Science/art Students by Benjaminbest(m): 3:45pm On Oct 07, 2014 |
more action pls |
Re: Jamb Lecture/past Questions For Science/art Students by chimhigher(m): 3:51pm On Oct 07, 2014 |
4 number 5,Total cost = power*time/1000 d ansa mutuplied by d amount in kilowatts xo therefore , time is 20 days xo we convert it 2 hours...24 hrs mke 1 day xo 20 days is 480hrs xo 200*480/1000=96kw...since 5k is For every kilowatt xo its 96kw*5=480k...buh recall its kwh(kilowattperhour) so 480k= N48.........D COST IS N48(forty eight naira) |
Re: Jamb Lecture/past Questions For Science/art Students by Benjaminbest(m): 4:00pm On Oct 07, 2014 |
good job continue i will take a bird view at ur work wen u are thru |
Re: Jamb Lecture/past Questions For Science/art Students by tuwayz(m): 4:34pm On Oct 07, 2014 |
What is the formula for calculating mid point, Pls u guys should be using jamb syllabus too so that this lectures will b organise and not just bringing up anything from the text book |
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