大家有無咩關於physics嘅問題但又無地方問

光學(optics) 嘅 virtual image, 我哋會透過extend 條light ray (畫dotted lines) 去定義個virtual image嘅位置。

點樣用Maxwell's Equations 去解釋 naked eye / camera 會 capture到呢d所謂嘅virtual image ?

Hubbles law 淨係 locality 先meaningful
佢個 v = h To Te/To 係 apparent velocity 唔係space dependent 架喎

唔係
只要你invest 夠多computational power 去做 individual 既 Naiver Strokes Equation solving 既話佢係particular situation 會有solution

Lambda CDM model 有個新既alternative theory
MOND
至於點解佢會expand

其實佢big bang initially 有KE
佢又無 net energy loss 咪繼續expand

聽講音速唔係一個固定數字

睇media
利申 dse physics

同Maxwell's Equation 無關係架喎
你當係一個神技之類既野
你用個light incident angle refractive index curvature 去計一樣可以出到result

點樣測試光速係點都係Constant?
點解？多左啲速度去左邊？

點揾 magnetic monopole

無
係assumption 只不過佢係experimentally consistent
http://hyperphysics.phy-astr.gsu.edu/hbase/c.html

因為relativity 既重點就係inertial frame 既transformation
所以例如你依家係一架太空船 travelling perpendicular to 地球
咁當你加速既時候
你相對於earth 既 velocity 會increase
咁當你既velocity in respect to the earth -> 光速既時候
係地球見到你架太空船樣會越黎越紅
by

應該咁講：點解會capture到 d virtual image 我想用fundamental d 嘅野去解釋 e.g 粒光子經過反射點樣encode咗呢d 資訊

因為佢用 convex lens refocus 個diffracted light
仲有photon 係wave唔係particle 喎
http://hyperphysics.phy-astr.gsu.edu/hbase/geoopt/surpow.html
你睇呢個啦
都係用differential equation 去計架啦

想問好耐
Fusion會令Mass變Energy
Fission又可以令Mass變Energy
但係明明兩個原理係相反 (二合為一 vs 一分為二)
點解都可以令Mass變Energy

Fusion 同fission 係release bonding energy
而bonding energy 會同 Higgs field interact (我唔太熟QM) 所以佢會behave 做mass

以前讀fluid mechanics
turbulence暫時仲未有好detail既mathematics去describe佢

https://www.youtube.com/watch?v=tzQC3uYL67U
https://www.youtube.com/watch?v=AInCqm5nCzw

Special relativity 基本上就係GR 既 foundation

都係Navier Strokes
只不過可能個element 要用particle 做 unit而咁做係唔realistic
無記錯既話Stochastic Dynamics 都有model 做過

佢好似要將所有既property例如velocity, pressure寫成
average+fluctuating, 之後就唔知點

佢個問題重點係個奇異點
奇異點到而家仲係個open question, 不過宇宙係誕生之後就唔存在「中間點」

經驗黎講，constrained motion(e.g. pendulum, motion on a curved surface)絕大部份都係用Lagrangian方便d, 甚至有時你唔用Lagrangian根本無可能諗到點搵條equation of motion

riemann tensor有咩用

一定猛俾人挑機，唔好晒自己時間