physics

A 58.0-kg man is riding an escalator in a shopping mall. The escalator moves the man at a constant velocity from ground level to the floor above, a vertical height of 3.70 m. What is the work done on the man by (a) the gravitational force and (b) the escalator?

  1. 👍
  2. 👎
  3. 👁
  1. change in potential energy = m g h
    the gravitation force is opposite to the direction of motion so work done = -m g h
    the escalator force is in the direction of motion so work done by it is +m g h

    1. 👍
    2. 👎
  2. 58.0*9.8*3.70
    =-2100 j 3 sig fig

    b) 2100 j 3 sig fig

    thanks Damon

    1. 👍
    2. 👎

Respond to this Question

First Name

Your Response

Similar Questions

  1. College Physics

    an escalator carries you from one level to the next in the airport terminal. the upper level is 4.5 m above the lower level, and the length of the escalator is 7 m. your mass is 60 kg. how much work does the up escalator do on you

  2. English

    In Call of the Wild, when John Thornton threatens against Hal against beating Buck any further, the conflict can best be described as a. man vs. man*** b. man vs. himself c. man vs. nature d. man vs. society

  3. Physics

    An escalator is 20 m long. If a person stands on the 'up' side, it takes 50 seconds to ride to the top. a) If a person walks up the escalator at a speed of 0.5 m/s relative to the escalator, how long wil it take to get to the top?

  4. physics

    the man hanging upside down is holding a partner who weighs 491 N. Assume that the partner moves on a circle that has a radius of 5.09 m. At a swinging speed of 4.20 m/s, what force must the man apply to his partner in the

  1. Physics

    An escalator carries 60 people of average mass 70 kg to a height of 5m in one minute.Find the power needed to do this.

  2. Physics

    Sau-Lan has a mass of 47 kg. She rides the up escalator at Ocean Park in Hong Kong. This is the world's longest escalator, with a length of 227 m and an average inclination of 31°. How much work does the escalator do on Sau-Lan?

  3. math

    A 40 foot long escalator rises from the first floor to the second of a shopping mall. The escalator makes a 30 degree angle with the horizontal. How high above the first floor is the second floor?

  4. Physics 2

    the escalator that leads down into a subway station has a length of 30.0m and a speed of 1.8 m/s relative to the ground. student is coming out of subway by running up the wrong direction on escalator. local record time for this is

  1. physics

    In a mall, a shopper rides up an escalator between floors. at the top of the escalator, the shopper turns right and walks 9.00m to store. the magnitude of the shopper's displacement from the bottom of the escalator is 16.0m. the

  2. english help please!!

    When Marilyn Cross is trapped, what kind of conflict does the pilot create for her? Man vs. Man Man vs. Society Man vs. Self Man vs. Nature

  3. Physics

    A man who is 6 ft tall is standing in front of a plane mirror that is 2 ft in length. If the mirror is placed lengthwise with its bottom edge 4 ft above the floor on a wall that is 5 ft away, how much of his image (i.e. what

  4. physics

    A 75.0-kg man is riding an escalator in a shopping mall. The escalator moves the man at a constant velocity from ground level to the floor above, a vertical height of 4.30 m. What is the work done on the man by (a) the

You can view more similar questions or ask a new question.