प्रकाशिकी 1
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29:00
centre of mass 2
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29:55
प्रकाशिकी 2
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37:32
Optics 1
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29:02
work energy theoram 2
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31:16
स्थिरवैद्युतिकी
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21:43
Eu passei 100 horas dentro das Pirâmides!
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1:04:21
Calming Meditation | 1 hour handpan music | Malte Marten
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46:40