Physics

posted by .

A 4610 kg helicopter accelerated upwards at 2 m/s^2. What lift force is exerted by the air on the propellers?

I was given this reply:

The air force on the prop blades is what accelerates the helicopter upward.

Use good old Newton's second law:

F = M a

Concern: When I mulplied the mass of the helicopter (4610 kg) by the acceleration (2 m/s^2) the answer was incorrect. What am I doing wrong?

  • Physics -

    You have twice posted problems in which you said you were given replies that were nonsense. I am beginning to question your veracity, and certainly, your understanding of basic physics. What bothers me most it you seem to be presenting no analysis nor thinking, but fishing for answers.

    See this:
    http://www.jiskha.com/display.cgi?id=1190238213

  • Physics -

    It was I who posted the previous answer.

    I should have clarified by saying that
    NET force = (Blade force)-(Weight) = M a

    Thus
    Blade force = Weight + M a
    = M (g + a)= (4610)(9.8 + 2)

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Physics

    A 4600 kg helicopter accelerated upward at 5 m/s^2. What lift force is exerted by the air on the propellers?
  2. Physics

    2.A 4430 kg helicopter accelerates upward at 2.2 m/s2. What lift force is exerted by the air on the propellers?
  3. Physics

    2.A 4430 kg helicopter accelerates upward at 2.2 m/s2. What lift force is exerted by the air on the propellers?
  4. Physics

    A 4610 kg helicopter accelerated upwards at 2 m/s^2. What lift force is exerted by the air on the propellers?
  5. physics

    A 4430-kg helicopter accelerates upward at 2.2 m/s2. What lift force is exerted by the air on the propellers?
  6. Physics

    "A 5000kg helicopter accelerates upwards at 0.50m/s^2 while lifting a 2000kg car. What is the lift force exerted by the air on the propellers?
  7. physics

    A 4600 kg helicopter accelerates upward at 2.26 m/s2. 2 The acceleration of gravity is 9.8 m/s . What lift force is exerted by the air on the propellers?
  8. physics

    A 4600 kg helicopter accelerates upward at 2.26 m/s2. 2 The acceleration of gravity is 9.8 m/s . What lift force is exerted by the air on the propellers?
  9. Physics

    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?
  10. Physics

    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?

More Similar Questions