Stats: 3,190,165 members, 7,939,673 topics. Date: Wednesday, 04 September 2024 at 10:17 AM |
Nairaland Forum / Nairaland / General / Education / Physics Gurus Pls Do Dis (1735 Views)
Physics Gurus Please Come In / Physics Gurus Come In Here....! / Problem With Physics ...physics Gurus Please Help (2) (3) (4)
Physics Gurus Pls Do Dis by Nobody: 8:33pm On Jul 07, 2015 |
A car 4m long came up behind a semi-trailer 20m long travelling at a steady rate of 72km/ h. The car driver then overtook the truck. If the car pulled out from behind the truck with the front of the car 10m behind the rear of the truck and accelerated at 3.5 m/s 2 until the rear of the car was 10m in front of the truck, how far would the car travel and how long would it take? |
Re: Physics Gurus Pls Do Dis by flames007(m): 8:40pm On Jul 07, 2015 |
hmm.....dis calls dy/dx + newtons laws.i'll be back! |
Re: Physics Gurus Pls Do Dis by marshalcarter: 8:47pm On Jul 07, 2015 |
Ur question no correct oo |
Re: Physics Gurus Pls Do Dis by Pinocchioo(f): 9:16pm On Jul 07, 2015 |
Queed come and see o |
Re: Physics Gurus Pls Do Dis by Nobody: 9:49pm On Jul 07, 2015 |
marshalcarter:wake up from Ur slumber... its correct |
Re: Physics Gurus Pls Do Dis by Nobody: 10:53pm On Jul 07, 2015 |
physics gurus rush in here.. don't be scared. |
Re: Physics Gurus Pls Do Dis by olusolaj(m): 10:58pm On Jul 07, 2015 |
the car would travel by 192.2m with the time of 7.4seconds Truck speed, St = 72km/h = 20m/s Distance covered by truck = P Truck Speed, St =P/t, where t is the time taken 20=P/t, t=P/20…………(1) also, Distance covered by car = 10+20+10+4+P Car Speed, SC =(10+20+10+4+P)/t Car acceleration, Ac ={(10+20+10+4+P)/t}/t = (10+20+10+4+P)/t^2 i.e 3.5 = (10+20+10+4+P)/t^2 i.e t^2 = (10+20+10+4+P)/3.5 ………..(2) sub. The value of t in equation 1 in equation 2 we have, (P^2)/(20^2) = (10+20+10+4+P)/3.5 i.e (P^2)/(400) = (44+P)/3.5 3.5P^2 - 400P - 17600 = 0 Therefore P = 148.21m or -33.93m Since the car & truck are moving forward, P cannot be negative Therefore P = 148.21m Then the distance covered by the car would be = 10+20+10+4+148.21 =192.21m Also, since the time taken for the car and truck are the same; time taken , t = 148.21/20 (i.e time, t = distance, P / Speed, St) = 7.41seconds |
Re: Physics Gurus Pls Do Dis by Queed: 10:58pm On Jul 07, 2015 |
Pinocchioo: who told this one that I am a physics guru?? ![]() ![]() Faba: This your question isn't properly asked ![]() though I think I somewhat understand it ![]() @the bolded o boy, it would travel an infinite distance as long as fuel no finish ![]() ![]() Had it been you asked how far HAS the car travelled hmmm... let's see 10m behind + 20m length of the trailer + 10m in front of the trailer + 4m length of the car + Xm distance travel by the trailer in time 't' the car took to overtake the trailer (yes, the trailer moved a certain distance too during the time the car used to overtake it) *Re-modified ![]() ![]() to find the distance X V = X/t t = -2u+sqrt(1600+8*3.5*44) /2*3.5 t = 1.9sec 72km/h = 20m/s 20= X/1.9 X= 38m total distance = 44+38= 82m total time = -2u+sqrt(1600+2296)/2*3.5 T = 3.2sec here you go... 82m,,, 3.2sec all calculations were done assuming there was NO relative motion between them AT FIRST ![]() Take this with a pinch of salt tho ![]() ![]() cc RobinHez ... Teempakguy Oya come and share your thoughts .. ![]() ![]() |
Re: Physics Gurus Pls Do Dis by Nobody: 11:23pm On Jul 07, 2015 |
Faba: olusolaj has gotten the right answer. Pains me that he beat me to it, but, ![]() What can I say? ![]() |
Re: Physics Gurus Pls Do Dis by Nobody: 11:31pm On Jul 07, 2015 |
olusolaj:How did u arrive at your answer.. |
Re: Physics Gurus Pls Do Dis by Nobody: 11:34pm On Jul 07, 2015 |
cc lasticlala fynestboi Richie abeg move dis to FP... I need more answers to be sure of the perfect one plssssssss... |
Re: Physics Gurus Pls Do Dis by marshalcarter: 11:39pm On Jul 07, 2015 |
Faba:Dats why you dey yab me naw ![]() |
Re: Physics Gurus Pls Do Dis by marshalcarter: 11:41pm On Jul 07, 2015 |
Queed:Plsssss gimme ya brain...e be lyk sey ma own need repairs ![]() |
Re: Physics Gurus Pls Do Dis by Nobody: 11:47pm On Jul 07, 2015 |
marshalcarter:Am sorry |
Re: Physics Gurus Pls Do Dis by Nobody: 11:50pm On Jul 07, 2015 |
Teempakguy:Seriously u are thinking like me... av done all that. |
Re: Physics Gurus Pls Do Dis by Nobody: 11:56pm On Jul 07, 2015 |
Faba:nothing bad in that. ![]() I sometimes don't get the answer to my problems too. But that is what everyone else is for. |
Re: Physics Gurus Pls Do Dis by Queed: 12:05am On Jul 08, 2015 |
marshalcarter: too much w33d I guess ![]() |
Re: Physics Gurus Pls Do Dis by olusolaj(m): 12:36am On Jul 08, 2015 |
Faba: Truck speed, St = 72km/h = 20m/s Distance covered by truck = P Truck Speed, St =P/t, where t is the time taken 20=P/t, t=P/20…………(1) also, Distance covered by car = 10+20+10+4+P Car Speed, SC =(10+20+10+4+P)/t Car acceleration, Ac ={(10+20+10+4+P)/t}/t = (10+20+10+4+P)/t^2 i.e 3.5 = (10+20+10+4+P)/t^2 i.e t^2 = (10+20+10+4+P)/3.5 ………..(2) sub. The value of t in equation 1 in equation 2 we have, (P^2)/(20^2) = (10+20+10+4+P)/3.5 i.e (P^2)/(400) = (44+P)/3.5 3.5P^2 - 400P - 17600 = 0 Therefore P = 148.21m or -33.93m Since the car & truck are moving forward, P cannot be negative Therefore P = 148.21m Then the distance covered by the car would be = 10+20+10+4+148.21 =192.21m Also, since the time taken for the car and truck are the same; time taken , t = 148.21/20 (i.e time, t = distance, P / Speed, St) = 7.41seconds 1 Like |
Re: Physics Gurus Pls Do Dis by Queed: 1:02am On Jul 08, 2015 |
Teempakguy: I gave a condition bro; [center]ALL CALCULATIONS WERE DONE ASSUMING THERE WAS NO RELATIVE MOTION BETWEEN THEM AT FIRST[/center] so you can't say I am wrong ![]() Trust me bro, I know how to escape shits like this ![]() |
Re: Physics Gurus Pls Do Dis by Nobody: 1:04am On Jul 08, 2015 |
Queed:I knew it. ![]() Well, it has been solved. Shame on us. . . I guess? ![]() |
Re: Physics Gurus Pls Do Dis by Queed: 1:24am On Jul 08, 2015 |
Teempakguy: better ![]() ![]() |
Re: Physics Gurus Pls Do Dis by Nobody: 1:27am On Jul 08, 2015 |
Queed:you're right. ![]() This is a wake up call for me. I've been monopolizing on mathematics. It's time to diversify. ![]() *slaps self in face five times!* ![]() I will go over my physics textbook again within the week and solve as many as possible problems. ![]() Cheers! ![]() |
Re: Physics Gurus Pls Do Dis by Nobody: 1:28am On Jul 08, 2015 |
olusolaj:good.... just wanted yo confirm Ur workings.. |
Re: Physics Gurus Pls Do Dis by Nobody: 1:30am On Jul 08, 2015 |
tnx for Ur time guys
cc olusolaj teempakguy queed |
Re: Physics Gurus Pls Do Dis by Nobody: 1:31am On Jul 08, 2015 |
Re: Physics Gurus Pls Do Dis by Nobody: 1:36am On Jul 08, 2015 |
Am going to drop some physics question more here during d day... |
Re: Physics Gurus Pls Do Dis by Queed: 1:38am On Jul 08, 2015 |
Re: Physics Gurus Pls Do Dis by olusolaj(m): 1:43am On Jul 08, 2015 |
Faba: you are welcome sir |
Re: Physics Gurus Pls Do Dis by EduRegard: 1:53am On Jul 08, 2015 |
marshalcarter:what we say when we don't get the answer to a question we personally think we solved correctly enough. ![]() |
Re: Physics Gurus Pls Do Dis by marshalcarter: 2:15am On Jul 08, 2015 |
EduRegard:Lol.....@ least I tried ![]() So you dey try talk sey I be olodo naw ![]() Anyway sha...na we we ![]() |
Re: Physics Gurus Pls Do Dis by marshalcarter: 2:20am On Jul 08, 2015 |
olusolaj:I bow before you albert einstein 1 Like |
(1) (Reply)
Best Methods Of Checking Your JAMB Result Online - Without Scratch Card / Get Experienced Loyola Jesuit Entrance Examination Tutors In Abuja, Lagos / This Is Why You Shouldn't Take Weed (experience)
(Go Up)
Sections: politics (1) business autos (1) jobs (1) career education (1) romance computers phones travel sports fashion health religion celebs tv-movies music-radio literature webmasters programming techmarket Links: (1) (2) (3) (4) (5) (6) (7) (8) (9) (10) Nairaland - Copyright © 2005 - 2024 Oluwaseun Osewa. All rights reserved. See How To Advertise. 55 |