Recent content by gemini2904

Hi, Thanks very much for all your help and for including the link, I get it now, finally! Sorry for the delay in replying, I've been really busy lately with Christmas preparations and unexpected visitors popping into spread their Christmas cheer - Joy! Bah humbug! Best wishes, Claire

Hi, Thanks very much for replying. I kind of get it but to ask a really stupid question what do I use for GM. I only have gravity and radius of the earth? I'm not given the mass or told to look it up? Cheers, Claire

Hi, Thanks for replying. Unfortunately were not given that equation at this stage and so the answer needs to be worked out some other way, which is the confusing bit! all were given is the above equation and for kepplers laws K = T^2/a^2 which I don't think is any help??

Thank's for clearing that up, Dick!

I guess the distance is the 30 000km but I still don't know what to do with it? Help!

Oh right sorry - I didn't realize, I just wanted to edge my bets!

Homework Statement A space station is placed in an orbit of radius 30 000km. What is the period of the station's orbit around the Earth? (I previously worked out the period of rotation of the space station as 22 secs but I didn't think it was relevant to this part of the question besides...

Homework Statement A space station is placed in an orbit of radius 30 000km. What is the period of the station's orbit around the Earth? (I previously worked out the period of rotation of the space station as 22 secs but I didn't think it was relevant to this part of the question besides...

Hi, Does that mean it's right?? ;) I think I finally got it, at last! Thank you so much for all your help everybody Claire

Hi, Do you mean cos theta = 7.0/20 = 0.35 giving theta = 69.5 degrees ? Which would be much simplier, not that I understand it any better, but here's hoping. Many thanks, Claire

Hi, Thanks very much for replying. Do you mean Vox = Vo cos theta cos theta = 7/20 = 0.35 so theta = 69.5 Many thanks, Claire

Hi, I got an answer of 5 degrees as the minimum angle, which seems very small. Is this right? I used R = (Vo^2/g) sin 2theta 2theta = sin-1 (9.8 x 7.0)/20 = 9.9 divide by 2 to give theta = 5 degrees Many thanks, Claire

Hi, Thanks Andrew, I'm still trying to digest what you said but thanks for replying. Would Vox = Vo Cos theta and Voy = Vo sin theta be on the right track? I worked out the distance the man's runs as 49m, is this right and is it really relevant. I'm not quite sure how or why I got...

Homework Statement Hi, From a previous question I have just worked out that the speed of the arrow launch is 20ms-1. The speed the mans can run is 7.0ms-1. Question, find the minimum angle above the horizontal at which the man must aim in order to outun the arrow. (you may assume the man is...

Homework Statement Hi, From a previous question I have just worked out that the speed of the arrow launch is 20ms-1. The speed the mans can run is 7.0ms-1. Question, find the minimum angle above the horizontal at which the man must aim in order to outun the arrow. (you may assume the man...