That 85 kg paratrooper from the 50's was moving at constant speed of 56 m/s because the air was applying a frictional drag force

Question

3 years ago

13

to him that matched his weight. If he fell this way for 40 m, how much heat was generated by this frictional drag force in J

1 answer:

Luba_88 [7] · Answer 1 · 2022-06-28T07:17:57+03:00

Answer:

46648 J

Explanation:

mass m= 85 Kg

velocity v = 56 m/s

distance covered s =40 m

According to Question,

frictional drag force to him that matched his weight

$\Rightarrow F_d =mg\\=85\times9.81=833 N$

Therefore, work done by practometer against the drag force = heat was generated by this frictional drag force in J

W=Q= F_d×s

=833×56 = 46648 J