27 November

Selamat hari lahir kakakku,

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Teori relativiti Einstein

Image
Einstein postulated bahawa 
1)Kelajuan cahaya itu malar atau constant.
Tak kiralah sama ada punca cahaya atau pemerhati tu statik ataupun bergerak.

Contohnya,

Cahaya bergerak dgn kelajuan 3x10^8 meter dalam masa sesaat
Sama ada kita tengah berlari atau dalam keadaan statik,cahaya punya kelajuan masih lg sama.

2)Tapi berlainan pula dengan jarak,masa dan jisim.
Kesemuanya adalah relatif kepada pemerhati.

Contohnya,
Kalau si A pegang sebiji bola di dalam kereta yang bergerak dgn kelajuan 50 km/h,
berapa kelajuan bola tersebut?

Di sini ada dua cara untuk jawab soalan tu,
Pertama,
Bola tu tak bergerak RELATIF kepada si A,

Kedua,
Bola tu bergerak dengan kelajuan 50 km/h RELATIF kepada orang yang berada kat luar kereta.

Contoh kedua;

bayangkan ada dua buah kereta,
kereta A bergerak dgn kelajuan 40km/h
dan kereta B bergerak dgn kelajuan 30km/h,

Kelajuan kereta A relatif kepada kereta B cuma 10 km/h,
tapi kalau orang kat sebelah jalan ukur kelajuan kereta A,
Dia akan dapat kelajuan kereta A tu 4…
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Du

I received a hand-written letter.Judging from the writing, I thought I was able to tell who sent it to me very easily. It was from someone. Someone I have known before. I was certain, 100% sure it was from her. 
Excited I tore the envelope and immediately threw it away. Took out the letter and began to read it. " It took you years to write this to me"  I murmured. Had not started reading the content yet.  That delighted I was. A bit frustrated as well.  Had she sent it a bit earlier, I would have felt better. A lot better. 
I read every sentence with a smile on my face.  It was like I took a trip down memory lane. 
"Ngah, ngah"  I could hear Mama calling for me. I immediately stopped reading so that I could hide her letter, as she neared my room. 
Mama's voice echoed and became slightly louder than it was before. 
I squinted as the light went on, was not able to open my eyes completely. 'It's time for Sahur' said Mama.
It was that moment I realised it was a dream.  My…
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