ByMia1307
Hi,
I need help with a task:
Hans builds a tower from 5 wooden cubes (edge length 5 cm, density 0.7 g per cm3).
b) The top die falls back down from the tower. At what speed does it fall to the table?
I need b and I already have the bill from b but I don't understand why it is like that.
there is v^2=2*g*20cm and I don't understand why that is
(1 votes)
Loading...Can anyone solve this equation? Please step by step.
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Der oberste Würfel fällt 4 Würfelhöhen nach unten, also ist die gesamte Fallstrecke h=4⋅5 cm = 20 cm = 0.2 m.
Solange er oben ist, beträgt seine potentielle Energien E=mgh, beim Fall wird die in kinetische Energie E=½mv² umgewandelt. Also gilt beim Aufschlag mgh=½mv². Die Masse kürzt sich heraus, und wir erhalten v=√(2gh) = √(2⋅9.81⋅0.2)≈ 2 m/s