binkybonks Posted January 31, 2008 Share Posted January 31, 2008 anyone know how to do this question, i'm lost Link to comment Share on other sites More sharing options...
Starbug Posted January 31, 2008 Share Posted January 31, 2008 anyone know how to do this question, i'm lost A car and a train move together along straight, parallel paths with the same constant cruising speed (V initial) . At t=0, the car driver notices a red light ahead and slows down with constant acceleration (-acceleration initial) . Just as the car comes to a full stop, the light immediately turns green, and the car then accelerates back to its original speed (V initial) with constant acceleration (acceleration initial). During the same time interval, the train continues to travel at the constant speed (V initial). In terms of initial V and initial acceleration: a) How much time does it take for the car to come to a full stop? b ) How much time does it take for the car to accelerate from the full stop to its original cruising speed? c) The train does not stop at the stoplight. How far behind the train is the car when the car reaches its original speed (V initial) again? Link to comment Share on other sites More sharing options...
CanucksAlways Posted January 31, 2008 Share Posted January 31, 2008 ^ thanks..i got parts a and b..t(1)=initial velocity/initial acceleration..and t(2)=t(1) just that t(1) was a negative divided by a negative..still kinda confused about part c though Link to comment Share on other sites More sharing options...
Starbug Posted January 31, 2008 Share Posted January 31, 2008 ^ thanks..i got parts a and b..t(1)=initial velocity/initial acceleration..and t(2)=t(1) just that t(1) was a negative divided by a negative..still kinda confused about part c though Link to comment Share on other sites More sharing options...
CanucksAlways Posted January 31, 2008 Share Posted January 31, 2008 That sounds right for parts a and b - it should be the same amount of time because it's the same velocity and same acceleration. What part of c confuses you? Link to comment Share on other sites More sharing options...
Starbug Posted January 31, 2008 Share Posted January 31, 2008 lol all of it..how do i calculate how far each goes..do i use the formula d=Vt+(1/2)at^2 for both of them? Link to comment Share on other sites More sharing options...
CanucksAlways Posted January 31, 2008 Share Posted January 31, 2008 Yep! You know from parts a & b that t = t1 + t2 = total time for car to reach V initial again. You know the acceleration of the car (you can use the absolute value of the acceleration because the car never travels backwards). You know V, which is the same for both vehicles. You know the acceleration (or lack thereof) of the train. Just plug it all in to find d[train] - d[car]. Link to comment Share on other sites More sharing options...
Starbug Posted January 31, 2008 Share Posted January 31, 2008 yayy i got it thanks Link to comment Share on other sites More sharing options...
canuck_trevor16 Posted February 3, 2008 Share Posted February 3, 2008 can someone please explain what is character development and a good example in animal farm? I need to know why the character development better than book can someone tell me if this is all right My first one is the book have more details, character development, and finally better message? anyone can help me? Link to comment Share on other sites More sharing options...
Flinch Posted February 3, 2008 Share Posted February 3, 2008 can someone please explain what is character development and a good example in animal farm? I need to know why the character development better than book can someone tell me if this is all right My first one is the book have more details, character development, and finally better message? anyone can help me? Link to comment Share on other sites More sharing options...
canuck_trevor16 Posted February 3, 2008 Share Posted February 3, 2008 please some hints? Link to comment Share on other sites More sharing options...
canuck_trevor16 Posted February 3, 2008 Share Posted February 3, 2008 Please someone help me! Link to comment Share on other sites More sharing options...
canuck_trevor16 Posted February 3, 2008 Share Posted February 3, 2008 I guess no one will help me.... Link to comment Share on other sites More sharing options...
Darkstar Posted February 3, 2008 Share Posted February 3, 2008 can someone please explain what is character development and a good example in animal farm? I need to know why the character development better than book can someone tell me if this is all right My first one is the book have more details, character development, and finally better message? anyone can help me? Link to comment Share on other sites More sharing options...
canuck_trevor16 Posted February 4, 2008 Share Posted February 4, 2008 no I want a the actual answer please anyone? Link to comment Share on other sites More sharing options...
louie_1 Posted February 4, 2008 Share Posted February 4, 2008 i need help for social studies 9 book is crossroads chapter 5 explain why a transportation system can help or hinder industrialization. (8 marks) thanxs Link to comment Share on other sites More sharing options...
Nuckin Figger Posted February 4, 2008 Share Posted February 4, 2008 whats the shortcut rule for making long ones like: 3x^2 + 2x - 8 into (3x-4)(x+2) Thanks Link to comment Share on other sites More sharing options...
MelonHelmet Posted February 4, 2008 Share Posted February 4, 2008 i need help for social studies 9 book is crossroads chapter 5 explain why a transportation system can help or hinder industrialization. (8 marks) thanxs Link to comment Share on other sites More sharing options...
MelonHelmet Posted February 4, 2008 Share Posted February 4, 2008 i need help for social studies 9 book is crossroads chapter 5 explain why a transportation system can help or hinder industrialization. (8 marks) thanxs Link to comment Share on other sites More sharing options...
Mr.Noodles Posted February 4, 2008 Share Posted February 4, 2008 whats the shortcut rule for making long ones like: 3x^2 + 2x - 8 into (3x-4)(x+2) Thanks Link to comment Share on other sites More sharing options...
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