Register to reply 
Where am I going wrong with this problem?by Canadian
Tags: None 
Share this thread: 
#1
Feb907, 11:58 AM

P: 27

The four 1.0 g spheres shown in the figure are released simultaneously and allowed to move away from each other.
Here's my attempt at a solution. All sphere's have same charge and are situated in a square. Thanks. 


#2
Feb907, 12:10 PM

Mentor
P: 41,258

I'm assuming you are asked for the final velocity of each of the masses with respect to the stationary frame of reference. One error I see, 1g does not equal 0.0001kg. The rest of your approach looks reasonable.



#3
Feb907, 03:58 PM

P: 27

Thanks, corrected the mass (silly me) and recalculated. Computer still doesn't like this answer???
Any ideas? 


#4
Feb907, 04:25 PM

Mentor
P: 41,258

Where am I going wrong with this problem?
I'm getting a different exponent on the potential energy terms. Maybe check your units in each of the equations to be sure you are using mks throughout. (Of course I may be calculating the potential energies wrong as well.)



#5
Feb1007, 01:32 AM

P: 27

My goodness it is questions like these that make me so angry. Just got an email back from my Prof he said I need to think about all the pairs in the problem. So I needed to take into account all six pairs in the problem (1 on 2, 1 on 3, 1 on 4, 2 on 3, 2 on 4, and 3 on 4).
Got the answer correct now thanks for all your help. 


Register to reply 
Related Discussions  
Electric Field problem Is my math wrong or am I doing something else wrong?  Introductory Physics Homework  6  
Problem, Where did I go wrong?  Introductory Physics Homework  1  
Wrong war, wrong place, wrong time, and Bush's Desert Shield Jr.  Current Events  6 