Home
Class 12
PHYSICS
A machine which is 75% efficient, use 12...

A machine which is 75% efficient, use 12 J of energy in lifting 1 kg mass through a certain height. The mass is then allowed to fall through the same height.Find the velocity at the end of its fall.

A

`sqrt(24)`

B

`sqrt(18)`

C

6

D

`sqrt9`

Text Solution

Verified by Experts

The correct Answer is:
D
Promotional Banner

Topper's Solved these Questions

  • WORK, ENERGY AND POWER

    AAKASH INSTITUTE ENGLISH|Exercise SECTION-C (OBJECTIVE TYPE QUESTIONS) (MORE THAN ONE OPTIONS ARE CORRECT)|16 Videos

  • WORK, ENERGY AND POWER

    AAKASH INSTITUTE ENGLISH|Exercise SECTION-D (LINKED COMPREHENSION TYPE QUESTIONS) (COMPREHENSION-I)|3 Videos

  • WORK, ENERGY AND POWER

    AAKASH INSTITUTE ENGLISH|Exercise SECTION-A (OBJECTIVE TYPE QUESTIONS (ONE OPTIONISCORRECT)|60 Videos

  • WAVES

    AAKASH INSTITUTE ENGLISH|Exercise ASSIGNMENT ( SECTION-D ( Assertion - Reason Type Questions ))|12 Videos

Similar Questions

Explore conceptually related problems

A machine which is 75 percent efficient, uses 12 joules of energy in lifting up a 1 kg mass through a certain distance. The mass is then allowed to fall through that distance. The velocity at the end of its fall is (in ms^(-1) )

A machine, which is 72 percent efficient, uses 36 joules of energy in lifting up 1kg mass through a certain distance. The mass is the allowed to fall through that distance. The velocity at the end of its fall is

A ball of mass m is dropped onto a floor from a certain height. The collision is perfectly elastic and the ball rebounds to the same height and again falls. Find the average force exerted by the ball on the floor during a long time interval.

A liquid drop of mass m andradius r is falling from great height. Its velocity is proportional to

A heavy mass M resting on the ground is connected to a lighter mass m through a light inextensible string passing over an ideal pulley. The string connected to mass M is loose. Let lighter mass m be allowed to fall freely through a height h such that the string becomes taut. If t is the time from this instant onward when the heavier mass again makes contact with the ground and Delta E is change in kinetic energy then

The power output of machine that lifts a 600 kg crate through a height of 20 m in 1 minute, is

A body freely falling from the rest has velocity v after it falls through a height h the distance it has to fall down for its velocity to become double is

Two hail stones with radii in the ratio of 1 : 2 fall from a great height through the atmosphere. Then the ratio of their momentum after they have attained terminal velocity is

Total energy of a body at rest at a height h from a point of reference is 75 J. What is its kinetic energy as it falls through a height h/2 ?

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 ?

AAKASH INSTITUTE ENGLISH-WORK, ENERGY AND POWER-SECTION-B (SUBJECTIVE TYPE QUESTIONS) (ONE OPTIONS IS CORRECT)
  1. A particle is placed on the top of a hemispherical shell of same mass....

    Text Solution

    |

  2. A bob is tied up with a string AB of length l. End A of the string is ...

    Text Solution

    |

  3. If the linear momentum is increased by 50%, then kinetic energy will b...

    Text Solution

    |

  4. A body of mass m was slowly pulled up the hill by a force F which at e...

    Text Solution

    |

  5. Work done by a spning force is

    Text Solution

    |

  6. A small body of mass m slides without friction from the top of a hemi...

    Text Solution

    |

  7. A motor drives a body along a straight line with a constant force. The...

    Text Solution

    |

  8. An engine pumps water continuously through a hole. Speed with which wa...

    Text Solution

    |

  9. A machine which is 75% efficient, use 12 J of energy in lifting 1 kg m...

    Text Solution

    |

  10. A bullet when fixed at a target with a velocity of 100 ms^(-1), penetr...

    Text Solution

    |

  11. A particle is rotated in a vertical circle by connecting it to a strin...

    Text Solution

    |

  12. The block of mass m is released when the spring was in its natrual len...

    Text Solution

    |

  13. Consider the spring blcok system shoen in the figure initially block m...

    Text Solution

    |

  14. Consider the spring block system shown in the figure initially block m...

    Text Solution

    |

  15. Consider the system shown in the figure. Coefficient of friction betwe...

    Text Solution

    |

  16. Consider the system shown in the figure. Coefficient of friction betwe...

    Text Solution

    |

  17. A particle of mass m initially moving with speed v.A force acts on the...

    Text Solution

    |

  18. A block of mass m is released from a height h from the top of a smooth...

    Text Solution

    |

  19. A particle of mass m initially at rest. A variabl force acts on the pa...

    Text Solution

    |

  20. A massive spring of mass m and length l is fixed at one end and the ot...

    Text Solution

    |