Problem 4.79 Part A What is the lift force exerted by the air on the helicopter

Question

Problem 4.79 Part A What is the lift force exerted by the air on the helicopter rotors? A 7130-kg helicopter accelerates upward at 0.70 m/s2 while lifting a 1080-kg frame at a construction site lgnore the mass of the cable. (Figure 1) Express your answer to three significant figures and include the appropriate units Fluft 5.63 10N Figure 1 of 1 Submit My Answers Give Up Incorrect; Try Again; 4 attempts remaining Part B What is the tension in the cable which connects the frame to the helicopter? Express your answer to three significant figures and include the appropriate units mg Fr= 7.41 . 10., IN

Explanation / Answer

(A) Applying Fnet = m a

on whole sytem,

F_air - m g = m a

F_air = (7130 + 1080) (0.70 + 9.81)

= 8.63 x 10^4 N

(B) FT - m g = m a

FT = 1080 (9.81 + 0.70)

FT = 1.13 x 10^4 N

(C) T = 1.13 x 10^4 N

(tension in rope will be same.)

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