Home
Class 12
PHYSICS
A helicopter is moving to the right at a...

A helicopter is moving to the right at a constant horizontal velocity. It experiences thre forces `vecF_("gravitational"), vecF_("drag")` force on it caused by rotor `vecF_("rotor")`. Which of the following diagrams can be a correct free body diagram represents forces on the helicopter?

A

B

C

D

Text Solution

Verified by Experts

The correct Answer is:
C



`vecF_(gravitational)` acts downwards.
`vecF_(drag)` acts opposite to the direction of motion.
Now let us see how `vecF_(rotor)` acts.
Wings of helicopter will push the air perpendicular to their plane or rotation as shown is figure (a). From third law, air will apply force `vecF_(rotor)` on the wings as shown in figure (b).
There is no force ma. Basically ma is the resultant of all the forces acting on a body. moreover, here a is zero because velocity of helicopter is constant.
Promotional Banner

Topper's Solved these Questions

  • CENGAGE PHYSICS DPP

    CENGAGE PHYSICS ENGLISH|Exercise subjective type|51 Videos
  • CENGAGE PHYSICS DPP

    CENGAGE PHYSICS ENGLISH|Exercise Multiple correct Answer Type|54 Videos
  • CAPACITOR AND CAPACITANCE

    CENGAGE PHYSICS ENGLISH|Exercise Integer|5 Videos
  • COULOMB LAW AND ELECTRIC FIELD

    CENGAGE PHYSICS ENGLISH|Exercise Single Answer Correct Type|22 Videos

Similar Questions

Explore conceptually related problems

A metallic shell has a point charge 'q' kept inisde its cavity. Which one of the following diagrams correctly represents the electric lines of forces?

A particle is projected at t=0 from a point on the ground with certain velocity at an angle with the horizontal. The power of gravitation force is plotted against time. Which of the following is the best representation?

A metal block is resting on a rough wooden surface. A horizontal force applied to the block is increased uniformly. Which of the following curves correctly represents velocity of the block ?

A vessel containing water is given a constant acceleration a towards the right,a straight horizontal path. Which of the following diagram represents the surface of the liquid.

A 1 kg solid sphere rolls without slipping on a rough horizontal surface under the influence of a 7 N force. The force acts tangentially at the highest point of the sphere. Which of the following statements are correct? ( 7 N force acts towards right).

A flatcar of mass m_0 starts moving to the right due to a constant horizontal force F(figure). Sand spills on the flatcar from a stationary hopper. The velocity of loading is constant and equal to mukg//s . Find the time dependence of the velocity and the acceleration of the flatcar in the process of loading. The friction is negligibly small.

A plank with a uniform sphere placed on it resting on a smooth horizontal plane. Plank is pulled to right by a constant force F . If sphere does not slip over the plank. Which of the following is incorrect?

Two blocks connected by a spring rest on a smooth horizontal plane as shown in Fig. A constant force F start acting on block m_2 as shown in the figure. Which of the following statements are not correct?

A ball of mass m kept at the corner as shown in the figure, is acted by a horizontal force F. The correct free body diagram of ball is

A frame of reference that is accelerated with respect to an inertial frame of reference is called a non-inertial frame of reference. A coordinate system fixed on a circular disc rotating about a fixed axis with a constant angular velocity omega is an example of non=inertial frame of reference. The relationship between the force vecF_(rot) experienced by a particle of mass m moving on the rotating disc and the force vecF_(in) experienced by the particle in an inertial frame of reference is vecF_(rot)=vecF_(i n)+2m(vecv_(rot)xxvec omega)+m(vec omegaxx vec r)xxvec omega . where vecv_(rot) is the velocity of the particle in the rotating frame of reference and vecr is the position vector of the particle with respect to the centre of the disc. Now consider a smooth slot along a diameter fo a disc of radius R rotating counter-clockwise with a constant angular speed omega about its vertical axis through its center. We assign a coordinate system with the origin at the center of the disc, the x-axis along the slot, the y-axis perpendicular to the slot and the z-axis along the rotation axis (vecomega=omegahatk) . A small block of mass m is gently placed in the slot at vecr(R//2)hati at t=0 and is constrained to move only along the slot. The distance r of the block at time is

CENGAGE PHYSICS ENGLISH-CENGAGE PHYSICS DPP-Single Correct Answer type
  1. A particle of m=5kg is momentarily at rest at time t=0. It is acted up...

    Text Solution

    |

  2. Three forces start acting simultaneously on a particle moving with vel...

    Text Solution

    |

  3. A helicopter is moving to the right at a constant horizontal velocity....

    Text Solution

    |

  4. As shown to the right, two blocks with masses m and M (Mgtm) are pushe...

    Text Solution

    |

  5. Consider the three cases given in figures shown. Assume the friction t...

    Text Solution

    |

  6. Calculate the tension in the string shown in figure. The pulley and th...

    Text Solution

    |

  7. In the shown mass pulley system, pulleys and string are massless. The ...

    Text Solution

    |

  8. A weight W is supported by two strings inclined at 60^(@) and 30^(@) t...

    Text Solution

    |

  9. Which of the following sets of concurrent force may be in equilibrium?

    Text Solution

    |

  10. A uniform sphere of weight W and radius 3 m is being held by a frictio...

    Text Solution

    |

  11. Two weights W1 and W2 in equilibrius and at rest are suspended as show...

    Text Solution

    |

  12. Four identical metal butterflies are hanging from a light string of le...

    Text Solution

    |

  13. Two smooth sphere each of radius 5cm and weight W rest one on the othe...

    Text Solution

    |

  14. A 50 kg person stand on a 25 kg platform. He pulls on the rope which ...

    Text Solution

    |

  15. Find the tension in the string AB loaded with weight W at the middlw, ...

    Text Solution

    |

  16. In the figure, at the free end of the light string, a force F is suppl...

    Text Solution

    |

  17. A car is moving on a plane inclined at 30^(@) to the horizontal with a...

    Text Solution

    |

  18. A wedge of height 'h' is released from rest with a light particle P pl...

    Text Solution

    |

  19. A cylinder rests in a supporting carriage as shown. The side AB of car...

    Text Solution

    |

  20. A ball is suspended on a thread from the ceiling of a car. The brakes ...

    Text Solution

    |