Recent content by Helly123

Homework Statement $$\int (sinx + 2cos x)^3dx$$ Homework EquationsThe Attempt at a Solution $$\int (sinx + 2cos x)^3dx$$ $$\int (sinx + 2cos x)((sinx + 2cos x)^2dx)$$ $$\int (sinx + 2cos x)(1 + 3cos^2x+2sin2x)dx$$ How to do this in simpler way?

Ok sir

Homework Statement [IMG]http://[url=https://ibb.co/b3Emfo]https://preview.ibb.co/gLaEY8/20180527_055248.jpg[ A conducting bar slides down without friction on a pair of conducting rails separated by distance d. Connected to resistor R and there magnetic field B directed upward, perpendicular to...

Thank you @Charles Link

Could it be like this? Force direction the same as Emf's ?

Homework Statement [IMG]http://[url=https://ibb.co/dgUy6T]https://preview.ibb.co/iyqS0o/20180525_213806.jpg Since i only know the field direction, increasing go into page. Why the answer is C? Why the answer "a" ? The R and r on the pic is respected to what? Homework EquationsThe Attempt...

Ek at min distance is zero. Ep = kQq/r_2 r_2 is the min distance K = 1/4pi.epsilon0 Ek1 + Ep1 = Ep2 + 0 Solve for r2 Thanks all

Yes.. the problem i get is non constant of acceleration. @Charles Link also pointed out important thing for me.

Homework Statement A point particle of mass m and charge q(>0) approaches to a point particle Q(>0) at a fixed position. When the distance between the two particles is L, the speed of the moving particle is v. The permittivity of the vacuum is denoted as Epsilon0. Find the minimum distance...

Oh. So superposition is y1 + y2 ? Why superposition not happen to be y1 - y2? How to know if both waves get destructive or constructive interference?

Ok. what is the relation?

Homework Statement 1. Homework Statement [/B] The displacement y of standing wave that is obtained by a superposition of waves : Y1 = 3 sin (2##\pi##(0.5t - 0 25 x)) Y2 = 3 sin (2##\pi##(0.5t + 0 25 x))Homework Equations Formula for standing waves Y = 2Asinkx coswt The Attempt at a Solution Y1...

Ok. Thanks sir

So, p f = 0.3 p i Not that pf 0.3 lower than pi?

Wow. Thanks a lot for reviewing all questions