c h � c h � c � m �t q u a n s � t m �i t � r a l � k h � n g p h � h �p t h � c h � n g t a c �n p h �i v �t b � h o �c p h �i s �a �i l � t h u y �t � . � t n h �t � l � i �u ��c x e m l � s � x �y r a , n h �n g b �n c in g l u � n l u � n c � t h � �t v �n � v � t h �m q u y �n c �a n g ��i t h �c h i �n q u a n s � t � .
T r � n t h �c t �, i �u t h ��n g h a y x �y r a l � m �t l � t h u y �t m �i t h �c r a c h � l � s � m � r �n g c �a l � t h u y �t t r ��c . V � d �, n h �n g q u a n s � t r �t c h � n h x � c v � h � n h t i n h T h �y ( m � t a q u e n g �i s a i l � s a o T h �y ) � c h o t h �y s � s a i k h � c n h � g i �a c h u y �n �n g c �a n � v � n h �n g t i � n o � n c �a l � t h u y �t h �p d �n N e w t o n . S � t h �t l � n h �n g t i � n o � n c �a E i n s t e i n h o � n t o � n n k h �p v �i q u a n s � t , t r o n g k h i n h �n g t i � n o � n c �a N e w t o n c h �a �t ��c i �u � - l � m �t t r o n g n h �n g k h �n g �n h c � t � n h c h �t q u y �t �n h �i v �i l � t h u y �t m �i . T u y n h i � n , c h � n g t a v �n c � n t h ��n g x u y � n s � d �n g l � t h u y �t c �a N e w t o n c h o n h �n g m �c � c h t h �c t i �n , b �i v � s � k h � c b i �t g i �a n h �n g t i � n o � n c �a n � v � c �a t h u y �t t ��n g �i r �n g l � r �t n h � t r o n g n h �n g t � n h h u �n g m � c h � n g t a g �p t h ��n g n g � y . ( L � t h u y �t c �a N e w t o n c in g c � n m �t �u i �m l �n n �a l � n � d � s � d �n g h �n l � t h u y �t c �a E i n s t e i n r �t n h i �u ) .
M �c � c h t �i h �u c �a k h o a h �c l � t �o r a ��c m �t l � t h u y �t d u y n h �t c � k h � n n g m � t � ��c t o � n b � v i t r �. T u y n h i � n , c � c h t i �p c �n m � p h �n � n g c � c n h � k h o a h �c t h �c s � t h e o u �i l � t � c h v �n � n � y r a l � m h a i p h �n . T h � n h �t l � n h �n g q u y l u �t c h o b i �t v i t r � s � t h a y �i n h � t h � n � o t h e o t h �i g i a n . ( N �u c h � n g t a b i �t � m �t t h �i i �m n � o � v i t r � l � n h � t h � n � o t h � c � c �n h l u �t v �t l � s � c h o c h � n g t a b i �t n � s � r a s a o � b �t k � t h �i i �m n � o t i �p s a u ) . T h � h a i l � v �n � v � t r �n g t h � i b a n �u c �a v i t r �. M �t s � n g ��i c �m t h �y r �n g c � l � k h o a h �c c h � n � n q u a n t � m t �i p h �n t h � n h �t ; h � x e m v �n � v � t r �n g t h � i b a n �u c �a v i t r � l � v �n � c �a s i � u h � n h h �c h o �c c �a t � n g i � o . H � c h o r �n g C h � a , �n g t o � n n n g c � t h � c h o v i t r � b �t �u t h e o b �t c � c � c h n � o m � N g ��i m u �n . C in g c � t h � l � n h � v �y , n h �n g t r o n g t r ��n g h �p � N g ��i c in g c � t h � l � m c h o v i t r � p h � t t r i �n m �t c � c h h o � n t o � n t � y � . N h �n g h � a r a N g ��i l �i c h �n c � c h l � m c h o v i t r � t i �n t r i �n m �t c � c h r �t q u y c � p h � h �p v �i m �t s � q u y l u �t . V � v �y c in g s � l � h �p l � n �u g i � t h i �t r �n g c in g c � n h �n g q u y l u �t c h i p h �i t r �n g t h � i b a n �u .
T h �c r a , r �t k h � c � t h � x � y d �n g ��c m �t l � t h u y �t m � t � ��c t o � n b � v i t r � t r o n g t �n g t h � c �a n � . T h a y v � t h �, c h � n g t a p h � n b � i t o � n t h � n h t �n g p h �n v � t � � p h � t m i n h r a n h i �u l � t h u y �t c � t � n h c h �t r i � n g p h �n . M �i m �t l � t h u y �t n h � t h � m � t � v � t i � n o � n c h � ��c m �t l �p h �n c h � n h �n g q u a n s � t , t r o n g k h i p h �i b � q u a �n h h ��n g c �a n h �n g �i l ��n g k h � c h o �c b i �u d i �n c h � n g b �n g t �p h �p �n g i �n c � c c o n s �. C in g c � t h � c � c h t i �p c �n n � y l � h o � n t o � n s a i l �m . N �u m �i v �t t r o n g v i t r � p h � t h u �c v � o n h a u m �t c � c h c n b �n , t h � s � k h � n g t h � t i �p c �n l �i g i �i �y � b �n g c � c h n g h i � n c �u c � c p h �n c �a b � i t o � n m �t c � c h r i � n g r �, c � l �p . T u y n h i � n , � c h �c c h �n l � c � c h m � c h � n g t a � l � m r a s � t i �n b � t r o n g q u � k h �. M �t v � d � k i n h i �n l �i l � l � t h u y �t h �p d �n c �a N e w t o n . L � t h u y �t n � y n � i v �i c h � n g t a r �n g l �c h �p d �n g i �a h a i v �t c h � p h � t h u �c v � o m �t c o n s � g �n l i �n v �i m �i v �t - � l � k h �i l ��n g c �a c h � n g , n h �n g l �i h o � n t o � n �c l �p v �i c h u y �n v �t � ��c l � m b �n g c h �t g � . N h � v �y n g ��i t a k h � n g c �n p h �i c � m �t l � t h u y �t v � c �u t r � c v � t h � n h p h �n c �a m �t t r �i v � c � c h � n h t i n h m � v �n t � n h ��c q u � �o c �a c h � n g . N g � y n a y , c � c n h � k h o a h �c m � t � v i t r � d �a t r � n h a i l � t h u y �t c � s � c � t � n h c h �t r i � n g p h �n , � l � t h u y �t t ��n g �i r �n g v � c � h �c l ��n g t �. H a i l � t h u y �t � l � n h �n g t h � n h t �u t r � t u � v )
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