emzz

When an object is moved away from another object, how do you calculate the time it takes for the stationary object to experience a change in the gravitational force due to the other object? I know in electric fields we calculate the time taken for an EM wave to travel the distance between the objects to find the time taken for the change in force to occur. Is there also a wave or something like that being emitted in a gravitational field?

Ooh alright. Thanks :eek_big:

Say I have a matrix [a] [c] And I want to get a new matrix which has the elements [0.7a] [0.6b] [0.4c], Is there any way that I can multiply the original matrix by another matrix to get the matrix that I want?

Would something like this work? img528.imageshack.us/img528/6016/untitledfo9.png (Add http to it) Someone suggested that I set up a circuit like that. Would it be able to measure the breakdown accurately? Thanks

Alright. Thanks a lot! ;)

Hi, I want to find out if there's any specific equipment to measure the dielectric breakdown of air? Or is there any way to construct something which can do so? Also, if I wanted to conduct an experiment to measure the dielectirc breakdown of air; what are the dependent and independent variables, and what factors would have to be held constant? Any help would be much appreciated! Thanks

Rite. Thanks for all your help :computerkeys:! Just one more question, the stopper is suppose to swing horizontally. However, when we did the experiment, we swung it at a slight angle at times. Would this affect the results at all? If yes, why?

Thanks, pyrotex :) By friction you mean air resistance? Could you explain in a little more detail please?

Thanks a lot! :) My teacher said he won't except human error as an answer though so that rules out hiccups and sneezing! Lol. And no heating/cooling system or fans were turned on during the course of the experiment. But i think i get the idea :lol:

Hi, We did the uniform circular motion experiment in school a few days ago in which we tied a rubber stopper to a string and swung it in a horizontal circle overhead. In our practical report we are required to list down some of the random and systematic errors that could have occured during the course of the experiment. Can someone help please? Also, how do you determine the mass of the stopper from the graph of F (nett force) vs T^2 (sec^2)? Thanks.

Hi! Newbie to the forum :). I'm a high school student doing my final year. Been lurking around a bit and I must say I'm astounded by how intelligent everyone is around here! Lol. Hope to see y'all around!