Mulia Rahmayani

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Mulia rahmayani 106017000533 NASAB APLIKASI PD dalam FISIKA 1. Seorang penerjun payung, terjun dengan kecepatan 55 m det-1 jika payungnya terbuka. Jika hambatan udara Wv2/25 N, di mana W adalah berat total orang dan payungnya, carilah kecepatan sebagai fungsi waktu t, setelah payung terbuka. Jawab: Gaya total pada system = berat system – hambatan udara.

Maka

=W-

atau

=-

dt.

Diintegrasikan di antara batas t = 0, v = 55 dan t = t, v = v,

= -

ln

- ln = -

,

t,

|v55 = -

ln

=

|t0.

, dan v = 5

.

Catatlah bahwa penerjun dengan segera mencapai kesempatan konstan, yaitu kecepatan akhir 5 m det-1.

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