Question

answer part a and b please

1 000 TH LIU Dale. 11/20/2019 11:59:00 PM (13%) Problem 6: A 75-kg skydiver jumps out of an airplane and falls 380 m, reaching a maximum speed of 59 m/s before opening her parachute. Randomized Variables m = 75 kg h = 380 m y = 59 m/s 50% Part (a) How much work, in joules, did air resistance do on the skydiver before she opened her parachute? 50% Part (b) Assuming the force of air resistance is constant, what is the magnitude of the force of air resistance, in newtons, on her? Grade Sum Fave = 1 Deductions Potential

Answer 1

here,

the mass of skydiver , m = 75 kg

the height , h = 380 m

the maximum speed , v = 59 m/s

a)

the work done on the skydiver by air , Wa = m * g * h - 0.5 * m * v^2

Wa = 75 * (9.81 * 300 - 0.5 * 59^2) J

Wa = 9.02 * 10^4 J

b)

let the constant force of air resistance be Fa

Wa = Fa * h

9.02 * 10^4 = Fa * 380

solving for Fa

Fa = 237.3 N

the constant force of air resistance is 237.3 N