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Nairaland Forum / Nairaland / General / Education / Nairaland Jamb Tutorial Centre {physics Thread} (12008 Views)
2016 NAIRALAND JAMB TUTORIAL {the Physics Thread } / Nairaland Jamb Tutorial Centre {chemistry Thread} / Nairaland Jamb Tutorial Centre. {NJTC} (2) (3) (4)
Re: Nairaland Jamb Tutorial Centre {physics Thread} by Jskelly11: 7:06pm On Nov 30, 2014 |
Question An electric heater is used to melt a block of ice of mass 1.5kg if the heater is powered by 12volts of a battery and current of 20amp flows through the coil calculate the time taken to melt the ice at 0¤C(specific latent heat of fusion of ice=336 X 10^3g/kg) |
Re: Nairaland Jamb Tutorial Centre {physics Thread} by Bhuumhite(f): 7:30pm On Nov 30, 2014 |
Jskelly11:ivt=ml;20 X 12 X t=1.5 X 336 X 10^3 240t=504 X 10^3 t=(504 X 10^3)/240 t=2.1 X 10^3 t=2100s or 35mins |
Re: Nairaland Jamb Tutorial Centre {physics Thread} by Jskelly11: 7:35pm On Nov 30, 2014 |
Bhuumhite:Nice you can also use pt=ml |
Re: Nairaland Jamb Tutorial Centre {physics Thread} by Bhuumhite(f): 7:37pm On Nov 30, 2014 |
Jskelly11:yh,p=iv |
Re: Nairaland Jamb Tutorial Centre {physics Thread} by LogoDWhiz(m): 7:47pm On Nov 30, 2014 |
jossayo:Same and time. |
Re: Nairaland Jamb Tutorial Centre {physics Thread} by Jskelly11: 7:58pm On Nov 30, 2014 |
Another question calculate the final temperature of 250g of water at 60¤C if added to 150g of water at 5¤C specific heat capacity of water =420j/kg ₹₹₹physics is sweet₹₹₹ |
Re: Nairaland Jamb Tutorial Centre {physics Thread} by Bhuumhite(f): 8:18pm On Nov 30, 2014 |
Jskelly11:m1C(t1-t)=m2C(t-t2) m1=250g=0.25kg m2=150g=0.15kg C=420j/kg t1=60¤C t2=5¤C t=? 0.25 X 420 X (60-t)=0.15 X 420 X (t-5) 105(60-t)=63(t-5) 6300-105t=63t-315 -105t-63t=-315-6300 -168t=-6615 t=-6615/-168 t=39.38¤C |
Re: Nairaland Jamb Tutorial Centre {physics Thread} by Jskelly11: 9:30pm On Nov 30, 2014 |
Bhuumhite:good Ma are you a jambite |
Re: Nairaland Jamb Tutorial Centre {physics Thread} by agafiya: 10:57pm On Nov 30, 2014 |
VEVEDIHNO:The formula to use is: v=u + at v(final velocity) = ? u(initial velocity) = 0m/s t(time) = 0.05s a(acceleration) = force/mass=30÷0.075= 400m/s^2 v=0 + 400×0.05 v=20m/s. NOTE: the v(final velocity) is the speed requested. |
Re: Nairaland Jamb Tutorial Centre {physics Thread} by Sirnuel: 11:12pm On Nov 30, 2014 |
VEVEDIHNO: A better approace F.T = MV - MU Where F = 30N T = 0.05s M = 0:075kg U = 0 V = ? 30 x 0.05 = 0.075 x V - 0:075 x 0 30 x 0.05 = 0.075V - 0 V = 30 x 0.05/0:075 V = 20M/S |
Re: Nairaland Jamb Tutorial Centre {physics Thread} by Kunlexic(m): 11:46pm On Nov 30, 2014 |
VEVEDIHNO: Impulse=momentum Ft=mv 30 x 0.05=0.075v V=30 x 0.05/0.075=20m/s |
Re: Nairaland Jamb Tutorial Centre {physics Thread} by Kunlexic(m): 11:58pm On Nov 30, 2014 |
Jskelly11:H=p x t=ivt=ml 20 x 12 x t=15 x 336 x 10^3 240t=504 x 10^3 t=504x10^3/240=2100s |
Re: Nairaland Jamb Tutorial Centre {physics Thread} by Kunlexic(m): 12:13am On Dec 01, 2014 |
Jskelly11:Heat loss= heat gained 250 x 420(60-@)=150 x 420 (@-5) 105000(60-@)=63000(@-5) 6300000-105000@=63000@-315000 6615000/168000=168000@/168000 @=39.4°¢ |
Re: Nairaland Jamb Tutorial Centre {physics Thread} by Bhuumhite(f): 1:02pm On Dec 01, 2014 |
Jskelly11:yes sir |
Re: Nairaland Jamb Tutorial Centre {physics Thread} by VEVEDIHNO: 1:26pm On Dec 01, 2014 |
Re: Nairaland Jamb Tutorial Centre {physics Thread} by mathefaro(m): 1:51pm On Dec 01, 2014 |
VEVEDIHNO:what help do you want from me |
Re: Nairaland Jamb Tutorial Centre {physics Thread} by bolaji3071(m): 4:59pm On Dec 01, 2014 |
please help me WHAT COURSE CAN I STUDY TO BECOME A CHEMISTRY TEACHER Chemistry OR Education and Chemistry And how many years course is it? |
Re: Nairaland Jamb Tutorial Centre {physics Thread} by FunkySilver(f): 9:00pm On Dec 01, 2014 |
Jskelly11:sowie sir, buh isn't specific heat capacity of water=4200j/kg |
Re: Nairaland Jamb Tutorial Centre {physics Thread} by Jskelly11: 9:25pm On Dec 01, 2014 |
FunkySilver:yah thanks typos tinz |
Re: Nairaland Jamb Tutorial Centre {physics Thread} by Nobody: 10:55pm On Dec 02, 2014 |
plz answer this, with a well detailed explanation. Que: An object is projected vertically upwards from a certain height, hits the ground after a few seconds. it has its maximum speed: A. at halfway mark travelling upwards B. at halfway mark travelling downward C. at exactly its highest point D. just before hitting the ground E. just before it reaches its highest point |
Re: Nairaland Jamb Tutorial Centre {physics Thread} by mathefaro(m): 7:06am On Dec 03, 2014 |
Preboy:C-just before hitting the ground because when a body is thrown vertically upwards, it's speed gradually decreases until it gets to the maximum height where it's speed is zero but as the body starts moving downwards, it accelerates, increasing it's speed until it gets to its maximum magnitude just before hitting the ground where the speed goes back to zero (body not moving anymore) |
Re: Nairaland Jamb Tutorial Centre {physics Thread} by LogoDWhiz(m): 5:32pm On Dec 04, 2014 |
Re: Nairaland Jamb Tutorial Centre {physics Thread} by jossayo(m): 1:33pm On Dec 05, 2014 |
i ave a problem wit a questn,n i dnt if it wasn't wellsoved ni. .if yu have newskool physics by anyakoha,go to page44,example 4.4,pls luk am wella,i tnk sumtin is wrong with the solutn |
Re: Nairaland Jamb Tutorial Centre {physics Thread} by Bhuumhite(f): 5:18pm On Dec 05, 2014 |
jossayo:post d qst hre instead |
Re: Nairaland Jamb Tutorial Centre {physics Thread} by bolaji3071(m): 6:38pm On Dec 05, 2014 |
d question goes thus. A density bottle holds 250g of liquid at 30 degree C and only 248.5g at 60 degree C. Find a. the apparent and b. the real cubic expansivity of the liquid, if the linear expansivity of the material of the bottle is Dg=0.000006 K^-1 Culled from New School Physics page 44 example 4.4 |
Re: Nairaland Jamb Tutorial Centre {physics Thread} by Kunlexic(m): 6:48pm On Dec 05, 2014 |
jossayo:here is d question A density bottle holds 250g of liqid at 30•C and only 248.5g at 60•C. Find a.the apparent and b.the real cubic expansivity of the liquid,if the linear expansivity of the material of the bottle is @g, let @ be alfa Soln ¥a is the apparent cubic expansivity and the formula for ¥a=volume of liquid lost or expelled/volume of liquid remaining x temperature rise And mass is proportional to volume. ¥a,apparent cubic expansivity=mass lost or expelled/remaining mass x rise in temperature (¤) The temperature rises from 30•C to 60•C and the mass changes from 250g to 248.5g dat is 1.5g of liquid is lost And change in ¤=60-30=30 ¥a=1.5/248.5 x 30=0.0002012K^-1 B. The real expansivity is ¥r,cubic expansivity is ¥ and apparent expansity is ¥a,so ¥=¥r-¥a, and ¥ is 3 times the linear exapnsion and u are given the linear expansion to be 0.000006K^-1 ¥=3@=3 x 0.000006=0.000018 From the formula,¥=¥r-¥a 0.000018=¥r-0.0002012 ¥r=0.0002192K^-1 |
Re: Nairaland Jamb Tutorial Centre {physics Thread} by jossayo(m): 8:38pm On Dec 05, 2014 |
Kunlexic:dnt u tnk d temp shud be converted to kelvin,since u re gettin ur ansa in per kelvin |
Re: Nairaland Jamb Tutorial Centre {physics Thread} by Kunlexic(m): 8:50pm On Dec 05, 2014 |
jossayo:no don't convert it,either per kelvin or per degree celcius |
Re: Nairaland Jamb Tutorial Centre {physics Thread} by VEVEDIHNO: 3:14am On Dec 08, 2014 |
A body at Rest Is Given An Uniform Acceleration Of 8m/s2 For 30s,After which the Acceleration Is Reduced To 5ms/2 for The Next 20s.The Body Maintains the Speed attained for 60s after which it is brought to rest in 20s. (1) Calculate the maximum Velocity of the body (2)Skecth The velocity time graph (3)using the graph calculate the total disatance retardation and The Average speed. Plz Help Me Out...Av Skecthed Out D Graph..And Also calaculated d Maximum Velocity Of The Body Plz Help Me out with d Solution On D 3rd Question dey asked. Tanks in Advance. |
Re: Nairaland Jamb Tutorial Centre {physics Thread} by Yustash001(m): 10:13am On Dec 08, 2014 |
VEVEDIHNO:total retardation....i get -12m/s^2 and i got 110.7m/s(not sure if it's correct) for average speed.. |
Re: Nairaland Jamb Tutorial Centre {physics Thread} by fasodecapo(m): 11:52am On Dec 08, 2014 |
VEVEDIHNO:maximum Velocity v2 = 340m/s. Check picture below for details
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