Home
Class 12
PHYSICS
A helicopter takes off along the vertica...

A helicopter takes off along the vertical with an acceleration `a = 3m//s^(2)` and zero initial velocity. In a certain time the pilot switches off the engine. At the point of take off, the sound dies away in a time `t_(2) = 30 sec`. Determine the velocity of the helicopter at the moment when its engine is switched off assuming that velocity of sound is 320 m/s.

Text Solution

Verified by Experts

The correct Answer is:
80
Promotional Banner

Topper's Solved these Questions

  • NTA JEE MOCK TEST 37

    NTA MOCK TESTS|Exercise PHYSICS|25 Videos

  • NTA JEE MOCK TEST 39

    NTA MOCK TESTS|Exercise PHYSICS|25 Videos

Similar Questions

Explore conceptually related problems

helicopter takes-off with zero initial velocity along the vertical with an acceleration of 3m/s^(2) . Displacement of helicopter in first 2 seconds is?

A particle is moving with initial velocity 1m/s and acceleration a=(4t+3)m/s^(2) . Find velocity of particle at t=2sec .

A particle is moving rectilineraly so that its acceleration is given as a = 3t^(2) + 1 m//s^(2) . Its initial velocity is zero.

A jet plane starts from rest with an acceleration of 3 ms^(-2) and makes a run for 35 s before taking off. What is the minimum length of the runway and what is the velocity of the jet at take off ?

The velocity of a projectile at the initial point A is (2hati+3hatj) m//s . Its velocity (in m/s) at point B is

The acceleration of paticle varies with time as : a(t) = 3t^(2) +4 If the initial velocity of particle is 2 m//s , find the velocity of particle at t = 3sec .

The velocity of a projectile at the initial point A is (2hat(i)+3hat(j))m//s .Its velocity (in m//s) at point B is

Velocity of a body moving with uniform acceleration of 3 m//s^(2) is changed through 30 m/s in certain time. Average velocity of body during this time is 30 m/s. Distance covered by it during this time is

A body has an initial velocity of 3m//s and has an acceleration of 1m//sec^(2) normal to the direction of the initial velocity. Then its velocity 4 seconds after the start is

A rocket is fired upward from the earth's surface such that it creates an acceleration of 20 m//s^(2) . If after 5 s its engine is switched off, the maximum height of the rochet from the earth's surface would be

NTA MOCK TESTS-NTA JEE MOCK TEST 38-PHYSICS
  1. Four rods with different radii r and length l are used to connect two ...

    Text Solution

    |

  2. An ideal diatomic gas with C(V)=(5R)/(2) occupies a volume V(1) at a p...

    Text Solution

    |

  3. A current - carrying wire of certain length is bent to form an arc tha...

    Text Solution

    |

  4. With what minimum acceleration can a fireman slide down a rope whose b...

    Text Solution

    |

  5. A raioactive sample contains 2.2 mg of pure .(6)^(11)C which has half-...

    Text Solution

    |

  6. A rod of mass 'M' and length '2L' is suspended at its middle by a wire...

    Text Solution

    |

  7. Lights of two different frequencies whose photons have energies 1 and ...

    Text Solution

    |

  8. Two unequal soap bubbles are formed one on each side of a tube closed ...

    Text Solution

    |

  9. Which one of the following spherical lenses does not exhibit dispersio...

    Text Solution

    |

  10. In the pully system shown, if radii of the bigger and smaller pulley a...

    Text Solution

    |

  11. V("BB") can vary between 0 and 5 V. Find the minimum value of base cur...

    Text Solution

    |

  12. The coefficient of volume expansion of glycerine is 49 xx 10^(-5)//^(@...

    Text Solution

    |

  13. The pressure on a square plate is measured by measuring the force on t...

    Text Solution

    |

  14. Consider two coherent, monochromatic (wavelength lambda) sources S(1) ...

    Text Solution

    |

  15. A thin plastic of refractive index 1.6 is used to cover one of the sli...

    Text Solution

    |

  16. A ball of mass m moving horizontally at a speed v collides with the bo...

    Text Solution

    |

  17. A wire of length L and 3 identical cells of negligible internal resist...

    Text Solution

    |

  18. A helicopter takes off along the vertical with an acceleration a = 3m/...

    Text Solution

    |

  19. A body A, oFIGURE m=0.1 kg has a initial velocity oFIGURE3hatikms^(-1)...

    Text Solution

    |

  20. If potential energy function for the force between two atoms in a diat...

    Text Solution

    |