Recent content by vf_one

Hey Thank you guys for your reply :) From NobodySpecial's hint I'm thinking that since the current in AC is alternating it will be more likely to cause ventricular fibrillation than DC. Can anyone confirm is this is right?

Why is AC more dangerous than DC even if the peak voltage of AC is the same as the DC voltage? This is a problem from our exam. Before I read the question I always thought that AC is more dangerous than DC because at the same voltage, AC voltage is higher as it has a peak voltage than DC. I've...

Hi everyone I'm having a bit of trouble solving this question. If anyone can help that would be awesome Homework Statement Rank the materials in the diagram according to their refractive indices from greatest to smallest (see attachment) The attempt at a solution The greater the...

We didn't go over this in class so this really helped. Thank you!

Hi I'm having difficulty understanding why the solution for the answer to the following problem is worked out this way. Three spheres are placed at fixed points along the x axis, whose positive direction points towards the right. Sphere A is at x=47cm with a charge of 5x10-6C Sphere B is...

Thank you so much for your help! :shy:

Hey Doc_Al Thanks for your help :biggrin: So would this be correct then? Ep1+Ek1 = Ek2 + Ep2 1/2 x 32 + 9.8 x 3 = 1/2 x v2 v = 8.2m/s

Hi I'm just going over some revision questions and there's this one question where I'm not sure if my working is correct (we don't get given the answers). Homework Statement A bobsled is moving at 3m/s as it passes a timing location. It then descends through a height of 3m before passing...

Oh thank you! I've never done a question on young's modulus before so this one was a good practice.

Hi I'm stuck on a particular practice question in mechanics and I'm hoping I can get some help Homework Statement The tension in the humerous (bone of upper arm) is 190N as a result of swinging a ball tied onto a string. What is the resulting change in the length of the humerous? (Assume...

I just did another question that was similar to this one except it was about skydiving and I was able to solve it. I think I understand this now. Thanks for your help!

Hey Tusike Thanks for your help! Sorry that was a typo, it was meant to say '9.1s, just after the engine stops' so your assumption was right. I still don't understand why you need to subtract the force found in i) by the forward force due to gravity. The next question asks to calculate...

Hi I'm having trouble with this problem and was wondering if anyone could help point me in the right direction. Homework Statement An experimental rocket-car of mass 1000 kg is at rest on a road that is inclined at 10 degrees to the horizontal. The driver starts the engine and releases...