Explain the 'twin paradox' with the use of a diagram.presidentsheep wrote:
Any more? Im bored
i did mine already...i'd have you check it, but i don't have the original problems (i didn't bring the book home)presidentsheep wrote:
Any more? Im bored
but tomorrow i'll have some probably.
"people in ny have a general idea of how to drive. one of the pedals goes forward the other one prevents you from dying"
Its maths, not physics, but I'm sure you guys can help.
not right now....no homework, I haven't been in school for 2 days because of the ice storm.presidentsheep wrote:
Any more? Im bored
Wish I got bloody ice storms... *jealous*TheunforgivenII wrote:
not right now....no homework, I haven't been in school for 2 days because of the ice storm.presidentsheep wrote:
Any more? Im bored
I'd type my pc specs out all fancy again but teh mods would remove it. Again.
I gave you a question. Where's my answer? D:presidentsheep wrote:
Wish I got bloody ice storms... *jealous*TheunforgivenII wrote:
not right now....no homework, I haven't been in school for 2 days because of the ice storm.presidentsheep wrote:
Any more? Im bored
I didnt see it!Peter wrote:
I gave you a question. Where's my answer? D:presidentsheep wrote:
Wish I got bloody ice storms... *jealous*TheunforgivenII wrote:
not right now....no homework, I haven't been in school for 2 days because of the ice storm.
Gimme a mo.
Yeh, im really bored.
#edit: theres no way i can do that, waaaaaaaaaaaaaay to advanced for my puny brain xD
Last edited by presidentsheep (2009-01-28 12:26:43)
I'd type my pc specs out all fancy again but teh mods would remove it. Again.
Is the thread for general physics questions? If it is I need help with integrals.
I'm not talking kinematics stuff, I'm mean stuff like finding inertia and center of mass.
I'm not talking kinematics stuff, I'm mean stuff like finding inertia and center of mass.
I can do basic stuff, but its more like A2 Physics by the sounds of it, which i havent done, i'll give it a try if you want?Ataronchronon wrote:
Is the thread for general physics questions? If it is I need help with integrals.
I'm not talking kinematics stuff, I'm mean stuff like finding inertia and center of mass.
I'd type my pc specs out all fancy again but teh mods would remove it. Again.
Peter: No idea, I never did that at A-level - you must be on a different exam board, or doing an option module that I didn't do. Though I might be able to teach myself ... maybe.
Ataronchronon: Give an example of a question. And, yes it does seem to have turned in to a general physics help thread.
Ataronchronon: Give an example of a question. And, yes it does seem to have turned in to a general physics help thread.
FP1.liquidat0r wrote:
Peter: No idea, I never did that at A-level - you must be on a different exam board, or doing an option module that I didn't do. Though I might be able to teach myself ... maybe.
Ataronchronon: Give an example of a question. And, yes it does seem to have turned in to a general physics help thread.
You not do further maths? :'(
Hard question is hard.
FP1 is hard:
Last edited by Peter (2009-01-28 12:41:52)
Yeah, I did FP1. But that stuff in your question 5 certainly wasn't on my syllabus.
Method of mathematical induction rings a bell - can't remember how to do it though. Did it two years ago and haven't used/seen it since.
Method of mathematical induction rings a bell - can't remember how to do it though. Did it two years ago and haven't used/seen it since.
I don't think anything you learn at ALevel you use again, unless you work at CERNliquidat0r wrote:
Yeah, I did FP1. But that stuff in your question 5 certainly wasn't on my syllabus.
Method of mathematical induction rings a bell - can't remember how to do it though. Did it two years ago and haven't used/seen it since.
I'd type my pc specs out all fancy again but teh mods would remove it. Again.
Uhhh, it's stuff like finding the center of mass of a cone of uniform density. Say the radius is 2 and the height is 8.
Involves using integrals which I haven't started yetAtaronchronon wrote:
Uhhh, it's stuff like finding the center of mass of a cone of uniform density. Say the radius is 2 and the height is 8.
I'd type my pc specs out all fancy again but teh mods would remove it. Again.
And where's the answer to my question!? (well it's not really a question, more a command, but still, I'm waiting 'sheep...)
Scorpion0x17 wrote:
Explain the 'twin paradox' with the use of a diagram.
As in, where one twin travels in space without the other one and they age differently? So you explain it using special relativity. But I can't be bothered and probably don't understand it enough anyway.Scorpion0x17 wrote:
And where's the answer to my question!? (well it's not really a question, more a command, but still, I'm waiting 'sheep...)Scorpion0x17 wrote:
Explain the 'twin paradox' with the use of a diagram.
Yeah, that's the one, and me neither.liquidat0r wrote:
As in, where one twin travels in space without the other one and they age differently? So you explain it using special relativity. But I can't be bothered and probably don't understand it enough anyway.Scorpion0x17 wrote:
And where's the answer to my question!? (well it's not really a question, more a command, but still, I'm waiting 'sheep...)Scorpion0x17 wrote:
Explain the 'twin paradox' with the use of a diagram.
I probs SHOULD know how to do this kinda thing..Ataronchronon wrote:
Uhhh, it's stuff like finding the center of mass of a cone of uniform density. Say the radius is 2 and the height is 8.
Would have done it last year at uni in (engineering) mechanics. Yeah, its more mechanics than "physics"... I'm going out later, but after that I can crack out the mechanics textbook if you really want some help.
If you're still bored you can work this problem out.....I read this question about 10 times and still couldn't figure it out and attempted it twice and couldn't get anything out of it. So give it try if you want to, I gave up on it .presidentsheep wrote:
Wish I got bloody ice storms... *jealous*TheunforgivenII wrote:
not right now....no homework, I haven't been in school for 2 days because of the ice storm.presidentsheep wrote:
Any more? Im bored
1) A particle leaves the origin with initial velocity vo = 10i + 18j m/s. It undergoes a constant acceleration given by a = –0.9i + 0.25j m/s2.
(a) When [i.e., for t greater than zero] does the particle cross the y axis? (answer in seconds)
(b) What is its y coordinate at that time? (answer in meters)
(c) How fast is it moving, and in what direction, at that time? (this question has two answers- one is velocity in m/s and second is θv from the +x axis)
if you dont factor in gravity, surely the 0.25j would mean it would just constantly accelerate upwards??TheunforgivenII wrote:
If you're still bored you can work this problem out.....I read this question about 10 times and still couldn't figure it out and attempted it twice and couldn't get anything out of it. So give it try if you want to, I gave up on it .presidentsheep wrote:
Wish I got bloody ice storms... *jealous*TheunforgivenII wrote:
not right now....no homework, I haven't been in school for 2 days because of the ice storm.
1) A particle leaves the origin with initial velocity vo = 10i + 18j m/s. It undergoes a constant acceleration given by a = –0.9i + 0.25j m/s2.
(a) When [i.e., for t greater than zero] does the particle cross the y axis? (answer in seconds)
(b) What is its y coordinate at that time? (answer in meters)
(c) How fast is it moving, and in what direction, at that time? (this question has two answers- one is velocity in m/s and second is θv from the +x axis)
I'd type my pc specs out all fancy again but teh mods would remove it. Again.
I have no idea . I never thought about gravitypresidentsheep wrote:
if you dont factor in gravity, surely the 0.25j would mean it would just constantly accelerate upwards??TheunforgivenII wrote:
If you're still bored you can work this problem out.....I read this question about 10 times and still couldn't figure it out and attempted it twice and couldn't get anything out of it. So give it try if you want to, I gave up on it .presidentsheep wrote:
Wish I got bloody ice storms... *jealous*
1) A particle leaves the origin with initial velocity vo = 10i + 18j m/s. It undergoes a constant acceleration given by a = –0.9i + 0.25j m/s2.
(a) When [i.e., for t greater than zero] does the particle cross the y axis? (answer in seconds)
(b) What is its y coordinate at that time? (answer in meters)
(c) How fast is it moving, and in what direction, at that time? (this question has two answers- one is velocity in m/s and second is θv from the +x axis)
i and j are vector forms of x and y bassically, so the 0.25 would just give you positive acceleration in the y axis.... question makes no sense to me :\ lol
I'd type my pc specs out all fancy again but teh mods would remove it. Again.
likewise.......that's why I gave up on this problem.presidentsheep wrote:
i and j are vector forms of x and y bassically, so the 0.25 would just give you positive acceleration in the y axis.... question makes no sense to me :\ lol
If anyone is still bored like "presidentsheep" told me you can work on these if you want.
1) A police officer investigating an accident estimates from the damage done that a moving car hit a stationary car at 25 km/h. If the moving car left skid marks 41 m long, and if the coefficient of kinetic friction is 0.68, what was the initial speed of the moving car? (answer is km/h).
2) Two large crates, with masses 640 kg and 490 kg, are connected by a stiff, massless spring (k = 7.5 kN/m) and propelled along an essentially frictionless, level factory floor by a force applied horizontally to the more massive crate. If the spring compresses 4.9 cm from its equilibrium length, what is the applied force?
~For this one I had 367.5 N, which is wrong and then remember that I forgot the include the two large crates, but I do not know how to enter that into an equation.
3) A camper hangs a 26 kg pack between two trees, using two separate pieces of rope of different lengths. What is the tension in each rope?
(a) What is the tension in the left section of the rope (answer in N)
(b) What is the tension in the right section of the rope (answer in N)
On "a" I got 134.740 N and on "b" 144.289 N but both are wrong and I don't know why...read my textbook and followed the equation but got it wrong.
1) A police officer investigating an accident estimates from the damage done that a moving car hit a stationary car at 25 km/h. If the moving car left skid marks 41 m long, and if the coefficient of kinetic friction is 0.68, what was the initial speed of the moving car? (answer is km/h).
2) Two large crates, with masses 640 kg and 490 kg, are connected by a stiff, massless spring (k = 7.5 kN/m) and propelled along an essentially frictionless, level factory floor by a force applied horizontally to the more massive crate. If the spring compresses 4.9 cm from its equilibrium length, what is the applied force?
~For this one I had 367.5 N, which is wrong and then remember that I forgot the include the two large crates, but I do not know how to enter that into an equation.
3) A camper hangs a 26 kg pack between two trees, using two separate pieces of rope of different lengths. What is the tension in each rope?
(a) What is the tension in the left section of the rope (answer in N)
(b) What is the tension in the right section of the rope (answer in N)
On "a" I got 134.740 N and on "b" 144.289 N but both are wrong and I don't know why...read my textbook and followed the equation but got it wrong.