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Re: Online tutorial in Physics, Chemistry, Maths for Jamb and pume by labodinho: 1:03am On Jan 07, 2014 |
Influence01: Ma boss,u've done well.You va 2 correct sir. |
Re: Online tutorial in Physics, Chemistry, Maths for Jamb and pume by labodinho: 5:38am On Jan 07, 2014 |
Let's have breakfast when we wake A circuit has an area of 0.4m^2 and consist of 50 loops of wire.If the loops are twisted and allowed to rotate at a constant angular velocity of 10rad/s in a uniform magnetic field of 0.4T,the amplitude in the induce voltage is? Good morning! |
Re: Online tutorial in Physics, Chemistry, Maths for Jamb and pume by DrLazDevitan: 6:14am On Jan 07, 2014 |
labodinho: Recall that the density of water is 1g/cm^3,so 42g of water obviously is also 42cm^3 of water! 42cm^3 of water contains 24.4g of Pb 1000cm^3 will contain (1000 * 24.4)/42 So, SOLUBILITY=581g/dm^3 |
Re: Online tutorial in Physics, Chemistry, Maths for Jamb and pume by labodinho: 6:24am On Jan 07, 2014 |
Dr. Laz'Devitan: Thanks Dr. Laz,I was thinking beyond. |
Re: Online tutorial in Physics, Chemistry, Maths for Jamb and pume by DrLazDevitan: 6:29am On Jan 07, 2014 |
[quote author=labodinho]Let's have breakfast when we wake A circuit has an area of 0.4m^2 and consist of 50 loops of wire.If the loops are twisted and allowed to rotate at a constant angular velocity of 10rad/s in a uniform magnetic field of 0.4T,the amplitude in the induce voltage?[/quote] Use E=wBAN......as a formular...u shall arrive at ur answer! |
Re: Online tutorial in Physics, Chemistry, Maths for Jamb and pume by DrLazDevitan: 6:32am On Jan 07, 2014 |
For those of u mailing me.....please get to know that nairaland does not send those emails,so i did not c any of them! |
Re: Online tutorial in Physics, Chemistry, Maths for Jamb and pume by labodinho: 6:43am On Jan 07, 2014 |
Dr. Laz'Devitan: Have you checked the inbox or spam of your E-mail address cause that's whr u get them. |
Re: Online tutorial in Physics, Chemistry, Maths for Jamb and pume by Nobody: 6:57am On Jan 07, 2014 |
Dr. Laz'Devitan:NO, THERE'Z NOTHING WRONG WITH THE QUESTION, In plane mirrors, image distance(v) and object distance(u) are equal, ...so their quotient is 1.0 hence, the answer is (B) 1.0 i hope you understand, francisTony and Devitan 1 Like |
Re: Online tutorial in Physics, Chemistry, Maths for Jamb and pume by Aibike(m): 7:06am On Jan 07, 2014 |
Dr. Laz'Devitan:thanx a bunch sir...! |
Re: Online tutorial in Physics, Chemistry, Maths for Jamb and pume by DrLazDevitan: 8:08am On Jan 07, 2014 |
Swagalord18: As much as i know,plane mirrors don't have magnification........this is becos the object and the image appear same as possible as i inferred earlier!....... |
Re: Online tutorial in Physics, Chemistry, Maths for Jamb and pume by Nobody: 8:39am On Jan 07, 2014 |
Dr. Laz'Devitan:+yawns+ ......and thats the reason why the magnification is always 1.0, ..it neither magnifies nor diminishes, ....the object distance is 10, so the image distance will be 10, .... Magnification = 10cm/10cm = 1.0, ....its that simple |
Re: Online tutorial in Physics, Chemistry, Maths for Jamb and pume by greatdavid1: 10:15am On Jan 07, 2014 |
More power to your elbow @ dr. Laz and all other gurus in da house. Let quickly take our brush with these; math: Integrat: (2x + 4 / x^2 + 4x + 5) + dx chem: on heating a concentrated HCl liquid,what type of gas is evolved, and what happens to the concentration of the acid phy: *name the two type of lens(es) used in an astronomical telescope |
Re: Online tutorial in Physics, Chemistry, Maths for Jamb and pume by greatdavid1: 10:17am On Jan 07, 2014 |
Swagalord18:i agree with swagalord.......but the fact still remains that plane mirrors don't magnify... |
Re: Online tutorial in Physics, Chemistry, Maths for Jamb and pume by Nobody: 10:54am On Jan 07, 2014 |
great.david:oga mi sir, though I am not sure with my answers, but I will try to solve them, and it's subjected to correction. maths: (2x+4/x^2+4x+5)dx--[please oga greatdavid, i don't think it suppose to be (+dx) but I'm subjected to correction. S[2x+4/x^2+4x+5]dx let u=x^2+4x+5 du/dx=2x+4 du=(2x+4)dx du/u=[(2x+4)/x^2+4x+5]dx Sdu/u=S[(2x+4/x^2+4x+5)]dx Sdu/u=Su^-1 du =loge^u+c simply, what's the answer is S[2x+4/x^2+4x+5]dx=S[d/dx(x^2+4x+5)]dx/x^2+4x+5 =loge^(x^2+4x+5)+c--->ans. phys the two lens in astronomical telescope is objective and eye piece lens. (the objective lens is a converging lens) |
Re: Online tutorial in Physics, Chemistry, Maths for Jamb and pume by Nobody: 10:54am On Jan 07, 2014 |
great.david:yeah ......in an exam situation,.....don't ignore the question thinking it's wrong ....please choose 1.0 |
Re: Online tutorial in Physics, Chemistry, Maths for Jamb and pume by Nobody: 11:01am On Jan 07, 2014 |
great.david:on heating conc. HCl(l), fumes of HCl(g) are liberated, making the solution more dilute, until it contains aproximately 20.2% Hydrochloric acid ....... in a case of dilute HCl(l), water evaporates from the solution on heating, making it more concentrated until it reaches the same hydrochloric acid content (20.2%) This kind of solution is known as "Azeotropic Mixture" or "Constant Boiling Mixture" |
Re: Online tutorial in Physics, Chemistry, Maths for Jamb and pume by Nobody: 11:02am On Jan 07, 2014 |
@oga great david, I didn't understand your question wella, but I hope other guru would answer that chemistry question. |
Re: Online tutorial in Physics, Chemistry, Maths for Jamb and pume by Nobody: 11:13am On Jan 07, 2014 |
aysuccess99: @oga great david, I didn't understand your question wella, but I hope other guru would answer that chemistry question. |
Re: Online tutorial in Physics, Chemistry, Maths for Jamb and pume by Nobody: 11:27am On Jan 07, 2014 |
Swagalord18:I've seen it, you've answered it, thats great, but I hope you'd get it sha...... |
Re: Online tutorial in Physics, Chemistry, Maths for Jamb and pume by Karleb(m): 11:48am On Jan 07, 2014 |
More questions pls. |
Re: Online tutorial in Physics, Chemistry, Maths for Jamb and pume by Aibike(m): 12:48pm On Jan 07, 2014 |
500cm3 of oxygen was collected over water at 30 degCelcius and 752mmHg pressure. What is the volume of dry Oxygen at S.t.p (vapour pressure of water at 30 degcelcius=32mmHg) |
Re: Online tutorial in Physics, Chemistry, Maths for Jamb and pume by labodinho: 1:05pm On Jan 07, 2014 |
Guys are boiling here,let's go there... 1) 2H2(g) + O2(g)------>2H2O(g) In the reaction above,what volume of hydrogen would be left over when 300cm^3 of oxygen and 1000cm^3 of hydrogen are exploded in a sealed tube? NB.-The Numbers In front of the equation are subscript. 2)A piece of filter paper moistened with Lead(ii)ethanoate solution turns black when the paper is dropped into a gas jar containing an unknown gas.The gas is likely to be A)Sulphur(iv)oxide B)Hydrogen chloride C)Sulphur(vi)oxide D)Hydrogen sulphide 3)What number of moles of Cu^2+ will be deposited by 360 coulombs of electricity? A)5.36 * 10^-4 mole B)1.87 * 10^-3 mole C)9.35 * 10^-4 mole D)3.73 * 10^-3 mole Tho they are all simple,just manage it ma gurus.Show workings where necessary. |
Re: Online tutorial in Physics, Chemistry, Maths for Jamb and pume by Aibike(m): 1:46pm On Jan 07, 2014 |
labodinho: Guys are boiling here,let's go there...2H2+O2=2H2O ratio of d volumes of d gases 2:1:2 pickin d least value,300cm3 2 multiply tru we av, 300*2:300*1:300*2 600 : 300 :600 subtract d new vol from d initials H O 1000 : 300 600:300 we av 400cm3 for hydrogen and Ocm3 for oxygen soderefor d ans is 400cm3 2 D,...H2S 3 CU^2+ + 2e^-=CU 1 mol of Cu^2+ is deposited by 2*96500c x mole mole of Cu^2+ is deposited by 360*1/2*96500=1.87*10^-3 moles 1 Like |
Re: Online tutorial in Physics, Chemistry, Maths for Jamb and pume by Aibike(m): 1:52pm On Jan 07, 2014 |
In d below reaction,.what is d value of x?Cr2O7^2- + 14H^+ + xe^-=2cr^3+ + 7H2O pls waht I need most is aw u get dat value,...xo ur workings is all I need |
Re: Online tutorial in Physics, Chemistry, Maths for Jamb and pume by Nobody: 2:20pm On Jan 07, 2014 |
Ai-bi-ke:according to Dalton's law, total pressure = sum of partial pressures so 752(total pressure) = 32(water pressure) + x(oxygen pressure) x = 752 - 32 = 720mmHg(oxygen pressure) p1V1/T1 = p2V2/T2 (gas equation) p1 = 720 mmHg V1 = 500 cm3 T1 = (30 + 273)K = 303K p2 = s.p = 760 mmHg V2 = T2 = s.t = 273K v2 = p1V1T2/p2T1 = 720 x 500 x 273/760 x 303 = 426.78 cm3 |
Re: Online tutorial in Physics, Chemistry, Maths for Jamb and pume by greatdavid1: 2:32pm On Jan 07, 2014 |
Ai-bi-ke:balance the charge at both sides..... Total no of charge in the RHS=> +14 + (-2)= +12 total no of charge in the LHS=> 2 *(+3)= +6 : . RHS must be equal to LHS i.e +12 + 6e^- = +6 x=6 thus, we have the equation as: Cr2O7^2- + 14H^+ + 6e^-=2cr^3+ + 7H2O |
Re: Online tutorial in Physics, Chemistry, Maths for Jamb and pume by Aibike(m): 2:47pm On Jan 07, 2014 |
Swagalord18:dats gr8 |
Re: Online tutorial in Physics, Chemistry, Maths for Jamb and pume by Aibike(m): 3:05pm On Jan 07, 2014 |
great.david:if dats d matter,...den what abt dis 2ClO3^- +12H^+ +12e^-=2Cl^- + 6H2O...does it mean iT is nt correct!.... |
Re: Online tutorial in Physics, Chemistry, Maths for Jamb and pume by Nobody: 3:14pm On Jan 07, 2014 |
Ai-bi-ke:it is correct |
Re: Online tutorial in Physics, Chemistry, Maths for Jamb and pume by greatdavid1: 3:14pm On Jan 07, 2014 |
Swagalord18:P1 = 720 mmHg and not 722 mmHg......typographical error |
Re: Online tutorial in Physics, Chemistry, Maths for Jamb and pume by greatdavid1: 3:24pm On Jan 07, 2014 |
Swagalord18:yep |
Re: Online tutorial in Physics, Chemistry, Maths for Jamb and pume by Nobody: 3:26pm On Jan 07, 2014 |
great.david:yeah ...while transferring from paper to phone ...final answer still accurate tho' .... |
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