Home
Class 11
PHYSICS
A rain drop of radius 0.3 mm has a term...

A rain drop of radius 0.3 mm has a terminal velocity I air 1 `ms^(-1)`.The viscosity of air is `18xx10^(-5)` poise.Find the viscous force on the rain drops.

A

`101.37xx10^(-4)` dyne

B

`101.73xx10^(-2)` dyne

C

`16.95xx10^(-5)` dyne

D

`16.95xx10^(-4)` dyne

Text Solution

Verified by Experts

The correct Answer is:
B
Given terminal velocity, `v=1ms^(-1)=100cms^(-1)` radius of the raindrop, r=0.3mm `=0.3xx10^(-1)"cm"`
Viscosity of air `eta=18xx10^(-3)"Poise"`
`therefore "Viscous force, F"=6 pi eta rv`
`=1017.36xx10^(-3)"dyne"=101.73xx10^(-2)"dyne"`
Promotional Banner

Topper's Solved these Questions

  • FLUID MECHANICS

    DC PANDEY ENGLISH|Exercise Match the columns|6 Videos

  • EXPERIMENTS

    DC PANDEY ENGLISH|Exercise Subjective|15 Videos

  • GENERAL PHYSICS

    DC PANDEY ENGLISH|Exercise INTEGER_TYPE|2 Videos

Similar Questions

Explore conceptually related problems

A rain drop of radius 0.3 mm has a terminal velocity in air 1m/s. the viscosity of air is 18xx10^(-5) poise. The viscous force on it is-

A rain drop of radius 0.3 mm falls through air with a terminal viscosity of 1 m s^(-1) . The viscosity of air is 18 xx 10^(-5) poise. The viscous force on the rain drop is

A viscous force of 1.018 xx 10^(-7) N acting on a raindrop makes it fall through air with a terminal velocity of 1 ms^(-1) . If the viscosity of air is 0.018 xx 10^(-3) PI, what is the radius of the raindrop? Hint : Stokes' law

The terminal velocity of a rain drop is 30cm//s . If the viscosity of air is 1.8xx10^(-5)Nsm^(-2) .The radius of rain drop is

A raindrop of radius 0.2 mm falls through air: If the viscosity of air is 18 xx 10^(-6) Pl, find the viscous drag acting on the drop when its speed is 1 m s^(-1) .

Eight rain drops of radius 1mm each falling downwards with a terminal velocity of 5 cm s^(-1) collapse to form a bigger drop. Find the terminal velocity of bigger drop.

A drop of water of radius 0.0015 mm is falling in air. If the coefficient of viscosity of air is 1.8 xx 10^(-5)kg//ms , what will be the terminal velocity of the drop? Density of water = 1.0 xx 10^(3) kg//m^(3) and g = 9.8 N//kg . Density of air can be neglected.

An oil drop falls through air with a terminal velocity of (5xx10^(-4))/(sec) viscosity of air is 18xx10^(-5)(N-s)/(m^(2)) and density of oil is 900 kg m^(3) neglect density of air as compared to that of oil.

An oil drop falls through air with a terminal velocity of (5xx10^(-4))/(sec) viscosity of air is 1.8xx10^(-5)(N-s)/(m^(2)) and density of oil is 900 kg m^(3) neglect density of air as compared to that of oil.

Six small raindrops each of radius 1.5 mm, come down with a terminal velocity of 6 cm s^(-1) . They coalesce to form a bigger drop. What is the terminal velocity of the bigger drop?

DC PANDEY ENGLISH-FLUID MECHANICS-Medical entranes gallery
  1. Two capillary tubes of lengths in the ratio 2 : 1 and radii in the rat...

    Text Solution

    |

  2. Two spherical soap bubbles of diameters 10 cm and 6 cm are formed, one...

    Text Solution

    |

  3. The ratio of inertial force to viscous force represets

    Text Solution

    |

  4. The excess pressure inside a soap bubble is twice the excess pressurre...

    Text Solution

    |

  5. Water rises to a height of 30 mm in a capillary tube. If the radius of...

    Text Solution

    |

  6. Which of the following is correct statement?

    Text Solution

    |

  7. Liquid rises to a height of 2 cm in a capillary tube and the angle of ...

    Text Solution

    |

  8. The ratio of radii of two bubbles is 2 : 1. What is the ratio of exces...

    Text Solution

    |

  9. A solid of density D is floating in a liquid of density d. If upsilon ...

    Text Solution

    |

  10. A rectangular vessel when full of water takes 10 minutes to be emptied...

    Text Solution

    |

  11. Water is moving with a speed of 5.18 ms^(-1) through a pipe with a cro...

    Text Solution

    |

  12. An ice block with a cork piece embedded inside floats in water.What wi...

    Text Solution

    |

  13. Assertion : The water rises higher in a capillary tube of small diamet...

    Text Solution

    |

  14. Water entering the root due to diffusion is part of

    Text Solution

    |

  15. The excess pressure inside a soap bubble of radius 6mm is balanced by...

    Text Solution

    |

  16. Water from a tap emerges vertically downwards with initial velocity 4m...

    Text Solution

    |

  17. How much heat energy is gained when 5kg of water at 20^(@)C is brought...

    Text Solution

    |

  18. Water flows in a streamline manner through a capillary tube of radius ...

    Text Solution

    |

  19. A rain drop of radius 0.3 mm has a terminal velocity I air 1 ms^(-1)....

    Text Solution

    |

  20. If two soap bubbles of different radii are connected by a tube

    Text Solution

    |