Recent content by city25

oh no, you are right. most students would choose business, medicine, law before engineering or science. But I really love engineering or physics even if I would be offered those programmes. The alternative that I may consider is the double degree programme (BEng & BBA). Engineering/physics is a...

no... I've never been to other countries. i wish to visit too!

OHH, you're really playing joke on me~~ haha! PS. well.. hong kong uses Traditional Chinese not Simple Chinese~

It's great~ ^^ yup~ I will stay in Hong Kong since my parent have no such money for me to go abroad. But what I'm worrying about is that HK is not a good place to study engineering. Maybe I will do part-time job and save some money to go overseas for my master degree (even dr.).

I really can't understand what you're talking about... but I feel you are joking on me.

Is it a joke??

oh, i must make a mistake now, let v be the velocity of the ball when it hits ground impluse = (mv - mu)/t net Force = ma impluse - mg = ma ma = (mv - mu)/t - mg a = (v - u)/t - g since t ∝ 1/k => t = μ/k where k is spring constant, μ is a constant hence, a = (v - u)k/μ - g da/dt =...

nice~ ^^

oh~ can you tell me more about it?

So, you mean that there is different explanation when it is in different cases? Is there any wrong or improper concept? How about this? Since t ∝ kx where k is the spring constant and x is displacement (how should I difine x?) => t = μkx where μ is a constant. hence, a ≤ -2u/μkx - g...

You got my point~ ^^

HAHA, but the rules state that we can only use english in the forum..

I first knew the forum few months ago. I was doing a project on friction. I found that some questions asked are similar to mine and helped me to solve my problems and finish my project. After that, I found that many topics discussed are very useful for me to correct my improper or unclear...

Hello~ I'm a "little" girl studying in secondary 6 (7 after 1/9) in HK~ I love physics very much~ I want to major in electrical engineering or physics in university ^^ I find this forum is quite useful so I registered to be a member~ Hope you guys can understand my poor english~ ^^

I have the answer 8.75N in a) too. But my ans in b) is 3 point something.