Testing everyone's Physics ability

[Archbob]

Sure, we are all webmaster, but how well do we know basic Physics?

1. What is newton's 2nd law of motion?

2. In terms of velocity and radius, what is the centripidal acceleration of an object going in a circle?

3. Giving that x(t)=3t^5-9t^4+3t^3+2t, what is a(t) ?

4.

Referring to capacitors: C= ?

5. Give the definiation of Work? In other words W(which is represented in Joules)= ?

6.

Neglecting Air resistance, if a ball is dropped from 50m, how long will it take to hit the ground?

7.
If two protons are moved twice as close to each other as they were before, how do their Potential energies compare with that of before?

8. In terms of m and v KE=?

9. Thermal Physics: Change in Energy (Delta Q) =

10. Conversion: 1ATM equals how many newtons/sqaure meter?

Answer these questions and you have a basic understanding in Physics.

Next time, I do a test on everyone's mathematic ability...

[Bruce]

Come on now. I can't remember any of this stuff. I haven't studied it since 6th grade.

[sp0radic]

:confused:

[Dusty]

Did you forget to do your homework, Archbob? :D

[Archbob]

No, I passed the Physics B exam last year, these are quite simple question.

I think I'm getting the picture that people do not know physics here.

[Bruce]

I did in 6th grade... I just don't remember anything.

[BluntBoy]

:confused: i dont know any of that

[Archbob]

Actually alot of that stuff is from Junior year in High school.

[stu]

I may be wrong on a lot of them..


Originally posted by Archbob
Sure, we are all webmaster, but how well do we know basic Physics?

1. What is newton's 2nd law of motion?

object with accelerate in the direction of a net force. force is proportional to acceleration

2. In terms of velocity and radius, what is the centripidal acceleration of an object going in a circle?

v^2/r

3. Giving that x(t)=3t^5-9t^4+3t^3+2t, what is a(t) ?

find the 2nd derivative of the function, with respect to t

4.

Referring to capacitors: C= ? Q/V

5. Give the definiation of Work? In other words W(which is represented in Joules)= ?

work = force * displacement

6.

Neglecting Air resistance, if a ball is dropped from 50m, how long will it take to hit the ground?

3 secs??

7.
If two protons are moved twice as close to each other as they were before, how do their Potential energies compare with that of before?

half ?

[Archbob]

1-5 are right. Anyways 5 is right to the nearest second and the exact answer to one I was looking for is F=MA . Now about the second dervitive, I'm still waiting to see if anyone here knows how to take derivitives.

7 is not right(at least according to that one physics book I read)

[DJsexie]

i didnt know that we could post homework questions here, i'll remember to ask you guys the next time i get stuck on my HW..^_^

:D

[Coolin]

Yeah.
Archbob is just hiding the fact that he didn't do his homework and he needs fast answers.

[DJsexie]

and the answers came within 30 min

[Gayowulf]

Archbob is right. Those are all pretty basic. I know how to take derivitaves, but i try to refrain from doing ----ty schoolwork in my spare time

[bigperm]

Did anyone else click on this one because they thought it was a psychic test?

[LastActionHero]

It's been almost 3 years since I read a physics textbook, I'm not in a mood to answer those :p

[LeX]

:yawn: What's 1 + 1? Anyone? :yawn::yawn:

[niv]

I don't have Physics Level C until next year and my junior high school neglected to teach me Physics so my answer is: :confused:

[polestar]

I start a degree in physics on Wednesday. Seriously!

[Epgs]

Originally posted by Archbob
1-5 are right. Anyways 5 is right to the nearest second and the exact answer to one I was looking for is F=MA . Now about the second dervitive, I'm still waiting to see if anyone here knows how to take derivitives.

7 is not right(at least according to that one physics book I read)

x(t)=3t^5-9t^4+3t^3+2t
second derivative is eaqual to a(t)= 15t^4-36t^3+9t^2
am i right? i just learned this stuff about a week ago

[polestar]

re: question one...

f=ma can be derived from the second law, but it actually says something like:

The rate of change of momentum is proportional to the motive force applied [in the direction of the (straight) line in which that force is applied]

As for all that second derivative ---- I find it way difficult to read the powers in that form - I'd have to write it down and I can't be arsed. Basically, if you can do a first derivative, just differentiate that again.

[kojiro]

i never did understood derivatives. :( I know how to do them but if you ask me how they come with them. Forget it

[LeX]

Originally posted by LeX
:yawn: What's 1 + 1? Anyone? :yawn::yawn: Gee... we've got some really brilliant minds here..... so far, nobody has been able to answer that mind-boggling question. :rolleyes:

[polestar]

eleven, goddammit!

[Archbob]

Sorry, epgs, that was the first derivitive.

[Coolin]

Originally posted by LeX
Gee... we've got some really brilliant minds here..... so far, nobody has been able to answer that mind-boggling question. :rolleyes: What is that crashy OS called again?

[LeX]

Originally posted by Coolin
What is that crashy OS called again? There's no = sign there, so nope that's not the answer.