Home
Class 11
PHYSICS
An electric motor creates a tension of 4...

An electric motor creates a tension of `4500` newton in a hoisting cable and reels it at the rate of `2 m//s`. What is the power of the motor ?

A

15 kW

B

9 kW

C

225 W

D

9000 kW

Text Solution

Verified by Experts

The correct Answer is:
`(2)`
`P_("inst") = vec F . vecV = FV cos theta`
Promotional Banner

Topper's Solved these Questions

  • WORK , ENERGY & POWER

    NARAYNA|Exercise EXERCISE -II (C.W)|75 Videos

  • WORK , ENERGY & POWER

    NARAYNA|Exercise EXERCISE -II (H.W)|75 Videos

  • WORK , ENERGY & POWER

    NARAYNA|Exercise EXERCISE - 1 (C.W)|70 Videos

  • WAVES

    NARAYNA|Exercise Exercise-IV|56 Videos

  • WORK POWER AND ENERGY

    NARAYNA|Exercise Level-VI (Integer)|12 Videos

Similar Questions

Explore conceptually related problems

An electric motor exerts a force of 40 N on a cable and pulls it by a distance of 30 m in one minute. The power supplied by the motor (in Watts ) is

What is the principle of an electric motor?

An electric motor in a crane while lifting a load produces a tension of 4000 N in the cable attached to the load. If the motor is winding the cable at the rate of 3ms^(-1) , the power of the motor espressed in kilo watt units must be

An electric motor exerts a constant torque 5Nm on a fly wheel by which it is rotated at the rate of 420 rpm The power of motor is

An electric motor rotates a wheel at a constant angular velocity (omega) while opposing torque is tau . The power of that electric motor is

An electric motor operating on a 30V supply draws a current of 10A and yields mechanical power of 120W. What is the efficiency of the motor? How much energy is lost as heat in 2h?

A motor rotates a pulley of radius 25cm at 20rpm. A rope around the pulley lifts a 50kg block, What is the power output of the motor?

NARAYNA-WORK , ENERGY & POWER -EXERCISE -1 (H.W)
  1. A crane can lift up 10,000 kg of coal in 1 hour form a mine of 180 m d...

    Text Solution

    |

  2. A man carries a load of 50 kg through a height of 40 m in 25 seconds. ...

    Text Solution

    |

  3. An electric motor creates a tension of 4500 newton in a hoisting cable...

    Text Solution

    |

  4. A juggler throws continuously balls at the rate of three in each secon...

    Text Solution

    |

  5. A bucket tied at the end of a 1.6m long string is whirled in a verticl...

    Text Solution

    |

  6. A body of mass 2 kg attached at one end of light string rotated along ...

    Text Solution

    |

  7. A pilot of mass m can bear a maximum apparent weight 7 times of mg. Th...

    Text Solution

    |

  8. The length of ballistic pendulum is 1 m and mass of its block is 0.98 ...

    Text Solution

    |

  9. A simple pendulum is oscillating with an angular amplitude 60^@. If ma...

    Text Solution

    |

  10. A body is moving in a vertical circle such that the velocities of body...

    Text Solution

    |

  11. A ball of mass 0.6 kg attached to a light inextensible string rotates ...

    Text Solution

    |

  12. Two particles of same mass m moving with velocities u(1) and u(2) coll...

    Text Solution

    |

  13. A ball impinges directly on a similar ball at rest. If 1/4 ^(th) of th...

    Text Solution

    |

  14. n bullets per sec each of mass m moving with velocity v strike normall...

    Text Solution

    |

  15. A heavy nucleus at rest breaks into two fragments which fly off with v...

    Text Solution

    |

  16. A 6 kg mass travelling at 2.5 ms^(-1) collides head on with a stationa...

    Text Solution

    |

  17. A body of mass 10 kg moving with a velocity of 5 ms^(-1) hits a body o...

    Text Solution

    |

  18. A block of mass 1 kg moving with a speed of 4 ms^(-1), collides with a...

    Text Solution

    |

  19. A marble going at a speed of 2 ms^(-1) hits another marble of equal m...

    Text Solution

    |

  20. A massive ball moving with speed v collieds with a tiny ball which is ...

    Text Solution

    |