Home
Class 11
PHYSICS
When a body falls in a air, the resistan...

When a body falls in a air, the resistance of air depends to a great extent on the shape of the body. The different shapes are given. Identify the combination of air resistance which truly represents the physical situation?
(The cross-sectional areas are the same)

A

1 lt 2 lt 3

B

2 lt3 lt 1

C

3 lt 2 lt1

D

3 lt 1 lt 1

Text Solution

Verified by Experts

The correct Answer is:
C
Fig (3) is stream lined, so air resistance of it will be minimum.For fig - 1 surface area is maximum, so air resistance for it is maximum. Hence correct sequence is `3lt2lt1`.
Promotional Banner

Topper's Solved these Questions

  • MECHANICAL PROPERTIES OF FLUIDS

    NARAYNA|Exercise EXERCISE - II (H.W) (EXCESS PRESSURE IN A LIQUID DROP AND IN A SOAP BUBBLE|5 Videos

  • MATHEMATICAL REVIEW & PHYSICAL WORLD

    NARAYNA|Exercise C.U.Q|13 Videos

  • MECHANICAL PROPERTIES OF SOLIDS

    NARAYNA|Exercise LEVEL-II (H.W)|24 Videos

Similar Questions

Explore conceptually related problems

When a body falls in air, the resistance of air depends to a great extent on the shape of the body, 3 different shapes are gives. Identify the combination of air resistances which truly represents the physical situation. (the cross sectional areas are the same).

A body falls from a height 'h'. In absence of air resistance time of descent of body is

A stone is allowed to fall freely from a certain Height. Neglecting air resistance, which graph represents the variation of velocity v with time t ?

Under the force of gravity, a heavy body falls quicker than a light body. (neglect air resistance).

Two bodies of different masses are dropped simultaneously from the top of a tower. If air resistance is proportional to the mass of the body then,

A body is thrown vertically upwards. If air resistance is to be taken into account, then the time during which the body rises is.

Two wires A and B are of equal lengths, different cross-sectional areas and made of the same metal. (a) (i) Name the property which is same for both the wires. (ii) Name the property which is the different for both the wires (b) I fthe resistance of wire A is four times the resistance of wire B , calculate (i) the ratio of the cross-sectional area of the wires. (ii) the ratio of the radii of the wires.

A power output from a certain experimental car design to be shaped like a cube is proportional to the mass m of the car. The force of air friction on the car is proportional to Av^(2) , where v is the speed of the car and A is the cross-sectional area. On a level surface the car has a maximum speed v_("max") . Assume that all versions of this design have the same density. The v_("max") is propotional to m^(1//c) . Find C

A body shape which offers very little resistance to the flow of air ( or water) around it is called :

NARAYNA-MECHANICAL PROPERTIES OF FLUIDS-EXERCISE - III
  1. Water is filled in a cylindrical container to a height of 3m. The rati...

    Text Solution

    |

  2. A candle of diameter d is floating on a liquid in a cylindrical contai...

    Text Solution

    |

  3. When a body falls in a air, the resistance of air depends to a great e...

    Text Solution

    |

  4. The heart of a man pumps 5 liters of blood through the arteries per mi...

    Text Solution

    |

  5. Water rises to height h in capillary tube. If the length of capillary ...

    Text Solution

    |

  6. The value of coefficient of volume expansion of glycerin is 5 xx 10^(-...

    Text Solution

    |

  7. The approximate depth of an ocean is 2700 m. The compressibility of wa...

    Text Solution

    |

  8. By sucking a straw a student can reduce the pressure in his lungs to 7...

    Text Solution

    |

  9. A drop of water of radius 0.0015 mm is falling in air .If the cofficie...

    Text Solution

    |

  10. A spherical body of diameter D is falling in viscous medium. Its termi...

    Text Solution

    |

  11. A non-viscous fluid of constant density of 1000kg//m^(3) flows in stre...

    Text Solution

    |

  12. The work done in increasing the size of a rectangular soap film with d...

    Text Solution

    |

  13. Surface area of a soap bubble is 1.3xx10^(-4) m^2. The work done to ...

    Text Solution

    |

  14. If the radius of a soap bubble is four times that of another, then the...

    Text Solution

    |

  15. Two small drops of mercury, each of radius R, coalesce to form a singl...

    Text Solution

    |

  16. A frame made of metalic wire enclosing a surface area A is covered wit...

    Text Solution

    |

  17. The potential energy of molecule on the surface of a liquid as compare...

    Text Solution

    |

  18. The wattability of a surface by a liquid depends primarily on

    Text Solution

    |

  19. A certain number of spherical drops of a liquid of radius r coalesce t...

    Text Solution

    |

  20. A boy has 60 kg-wt. He wants to swim in a river with the help of a woo...

    Text Solution

    |