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1. ### How long to reach 0.9 c, accelerating at 1 gravity?

...relativistic mass M is km, where k is the Lorentz factor, k = c / (c^2 - v^2), where c is of course the speed of light. Now, we usually...

5 Answers · Science & Mathematics · 02/11/2006

2. ### Physics Geometric Optics question?

... with this speed. Then time of traverse dt will be dt = dx/(-c/kx) = -(k/c)* xdx So the total time of traverse (T) to go over right from the height...

2 Answers · Science & Mathematics · 06/03/2010

3. ### Help with Physics question?

...it like that! Note that you can only use kelvin for this, not celcius. K = C + 273. so: So we have 2 sets, v1 and 21C, and v2 and ...

1 Answers · Science & Mathematics · 23/09/2011

4. ### Physics 20 help- graphing period as a function of spring constant?

... = 2pi*sqrt(m) * 1/sqrt(k) y = m*x + c y => T x => 1/sqrt(k) c = 0 (should go through origin) slope m = 2pi*sqrt(mass) Unit is kg^0...

2 Answers · Science & Mathematics · 29/05/2013

5. ### a block of mass 1.5kg slides on a rough horizontal table with a coefficient of kinetic friction equal to 0.25.?

...formula: we'll get: x = [ -b + sqrt(b^2 - 4ac) ] / 2a which: b = 2μmg a = k c = -mv^2 we'll get: b^2 -4ac = 2 sqrt(μmg + kmv^2) ==> x = 2[-μmg + sqrt...

2 Answers · Science & Mathematics · 16/08/2012

6. ### Determine the acceleration of the system and the tension in each cable.?

Let T1 = tension in cable AB and T2 = tension in cable BC. Let a = common acceleration of the system. Cosidering free body diagrams of blocks A, B and C, for dynamic equilibrium of the blocks, 25g * sin30...

2 Answers · Science & Mathematics · 26/11/2011

7. ### Physics problem? HELP!?

Well basically, E will apply force on electron in -j^ because e- is -vely charged so B has to be in dirxn. outwards perpendicular to plane of paper i.e. in +ve k^ (flemming left hand rule) so as to cancel force due to E. So answer is out of B) or E) option, pt...

2 Answers · Science & Mathematics · 28/10/2013

8. ### Extremely Difficult Unit Vector Question?

I think: BACC Explanation follows. _______________________________ (i) B is true because for a cross product to be zero, the vectors must be parallel. (3î) X B=0 means B is parallel to î (the x axis...

3 Answers · Science & Mathematics · 07/11/2012

9. ### extremely hard physics questions...with answers...but plz show how u got answer...i couldn't get these ones...

both are right. good luck picking best answer!

3 Answers · Science & Mathematics · 11/01/2008

10. ### Physics Potential/kinetic energy question.?

If the air is gone, the potential energy from the spring should equal the potential energy the dart has when it reaches maximum height, but that's not the case here. The potential energy from the spring = force x dist. (spring compression) x (distance spring goes back to original length) = work...

1 Answers · Science & Mathematics · 03/11/2014