# Recent content by hms.tech

1. ### Finding the number of arrangements

Which problem are u addressing : 1. 3 Reds and 3 Blues 2. 6 red and 3 blues If the FIRST one then here is my question to u : How can two red balls touch each other for it is given that the blue balls must be apart from each other . If any red ball was to touch another red ball, the two of...
2. ### Finding the number of arrangements

*amazed* You are right. So how would we proceed in this case , do u have any leads ?
3. ### Finding the number of arrangements

Lets put our method to test, what if the number of red balls and blue balls were not equal . There are 5 red balls (distinguishable) and 3 blue balls (distinguishable) , find the number of possible permutations in which all blue balls are not next to each other . I would speculate : for the...
4. ### Finding the number of arrangements

Homework Statement In how many ways can 3 red and 3 blue balls be arranged if no two balls of the same colour are next to each other ? Homework Equations .... The Attempt at a Solution Here is what i did (Which is wrong) 6 x 3 x 2 x 2 x 1 x 1 I did this since there are 6...
5. ### Electrolysis of Iron(II)Sulphate

It does indeed but that is something different. In this particular example we have : Fe(II) ions , water molecules, extremely low number of Hydrogen ions and hydroxide ions, Sulphate ions . Since the concentration of Hydrogen ions is almost negligible (as is the case in any aqueous...

7. ### Electrolysis of Iron(II)Sulphate

Homework Statement I am given a 1 M solution of Iron(II)sulphate(aq) and it is being electrolyzed using inert electrodes . What will form on the cathode ? Homework Equations Reduction potentials of : Fe =-0.44V of water to from hydrogen : -0.83V The Attempt at a Solution Since...
8. ### Moment of Inertia - Swinging arms

No, it is τ = Iα where α is the angular acceleration
9. ### Simple Harmonic motion : Is energy conserved

It is a needle which is being moved by an automated sewing machine I really can't see why do you need that information to answer the question : Why isn't Energy conserved in this problem ? In ANY case, the total energy at each and every point (displacement) during the SHM must be the same
10. ### Simple Harmonic motion : Is energy conserved

I thought i had uploaded it, sorry for that. Anyways, it is under gravity and it is going SHM. (why wouldn't it)
11. ### Simple Harmonic motion : Is energy conserved

Homework Statement I doubt energy is conserved in SHM, or it might be possible that i be doing something wrong. The particle (red dot) in the attachment is at its equilibrium position and oscillates with Simple Harmonic Motion between the two yellow colored plates. Amplitude A = 1.5 m...
12. ### The concept of rotational equilibrium

I cant see the logic in your answer . I think that even if all three forces were passing through the Center of mass, there MIGHT still be a net torque ! Let me prove it : https://www.physicsforums.com/attachment.php?attachmentid=57701 Consider this diagram in which the three forces are...
13. ### The concept of rotational equilibrium

This book was recommended as a great book for introductory physics by ppl here on PF Physics for Scientists & Engineers by Serway. As mentioned in the first post, there was this quiz on page 349~350 which asked whether the given object is in equilibrium, i stumbled across it while reading...

Not at all
15. ### The concept of rotational equilibrium

Here is a text from my Physics Book : The net external torque on the object about any axis must be zero for it to be in rotational equilibrium. I divide the torques into two categories, anticlockwise and clockwise. (This approach works fine for 2-D objects but will it work for 3-D objects...