Homework Help: Physics

Posted by Freddy on Tuesday, October 23, 2012 at 4:55am.

A 7900- helicopter accelerates upward at 0.90 while lifting a 1100- frame at a construction site.
A) What is the lift force exerted by the air on the helicopter rotors?
B)What is the tension in the cable (ignore its mass) that connects the frame to the helicopter?
C)What force does the cable exert on the helicopter

Physics - Jennifer, Tuesday, October 23, 2012 at 10:59am
m*a = Liftforce - m*g

In this case m is the combined mass of the helicopter and frame,

so

9000*0.9 = Liftforce - 9000*g

Solve for lift force

B) Drawing a free body diagram on the frame:

T - mg = m*a

T - 1100*9.8 = 1100*0.9

Solve for T

C) Drawing a free body diagram on the helicopter:

Liftforce - 7900*g - F(cable) = 7900*a

Answer this Question

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