PHYSICS.

5. A motor lifts a 12 kg mass to a height of 15 m at a constant velocity in 3.5 s.
a) Find the power b) If the motor is only 35% efficient find the input energy.

  1. 👍 0
  2. 👎 0
  3. 👁 109
  1. a) m g h / t

    b) answer to a /.35 is power input
    that times 3.5 is energy input.

    1. 👍 0
    2. 👎 0
    posted by Damon

Respond to this Question

First Name

Your Response

Similar Questions

  1. Physics

    Searches related to a motor lifts an elevator of mass m at constant speed. The power output of the motor is P and there are no frictional losses so that all the power output from the motor goes into lifting the elevator mass. What

    asked by Bobby on November 10, 2016
  2. Physics

    A motor lifts an elevator of mass m at constant speed. The power output of the motor is P and there are no frictional losses so that all the power output from the motor goes into lifting the elevator mass. What is the correct

    asked by Bobby on November 10, 2016
  3. Physics

    a motor lifts a 12 kg mass to a height of 15 meters at a content velocity in 3.5 seconds. a) find the power b) if the motor is only 35% efficient find the input energy

    asked by Unknown on June 16, 2014
  4. Physics :)

    A motor lifts a 70.0 kg box off the ground, starting from rest. In 8.00 seconds it lifts the box to a height of 20.0 m. At that time, the box is moving upward with a velocity of 5.00 m/s. What is the average power of the motor

    asked by Kate on June 2, 2012
  5. physics question

    a forklift lifts a 100 kg of concrete through a vertical height of 16 m in 20 sec.the power applied to the motor un driving the forklift is 1kw.a) calculate the work done every second in lifting the concrete block.b) what is the

    asked by pherlysstar on April 7, 2017
  1. physics

    two people carry a heavy electric motor by placing it on a light board 2m long.one person lifts at one end with a force of 700N, and the other lifts the opposite end with a force of 400N.Calculate the weight of the motor and

    asked by Anonymous on April 28, 2013
  2. physics

    two people carry a heavy electric motor by placing it on a light board 2m long.one person lifts at one end with a force of 700N, and the other lifts the opposite end with a force of 400N.Calculate the weight of the motor and

    asked by Anonymous on April 28, 2013
  3. physics

    two people carry a heavy electric motor by placing it on a light board 2m long.one person lifts at one end with a force of 700N, and the other lifts the opposite end with a force of 400N.Calculate the weight of the motor and

    asked by Anonymous on April 28, 2013
  4. physics

    Two people carry a heavy electric motor by placing it on a light board 2.00 m long. One person lifts at one end with a force of 400.0 N, and the other lifts at the opposite end with a force of 600.0 N. What is the weight of the

    asked by Student1 on November 9, 2009
  5. Physics

    Two people carry a heavy electric motor by placing it on a light board 2 meters in length. One person lifts at one end with a force of 700 N, and the other lifts the opposite end with a force of 500 N. What is the weight of the

    asked by Scott on April 16, 2018

More Similar Questions