physics

Your engineering firm is asked to specify the maximum load for the elevators in a new building. Each elevator has mass 500 kg when empty and maximum acceleration 2.25 m/s^2. The elevator cables can withstand a maximum tension of 19.6 kN before breaking. For safety, you need to ensure that the tension never exceeds two-thirds of that value. What do you specify for the maximum load?How many 75.0-\rm kg people is that?

  1. 👍 0
  2. 👎 0
  3. 👁 306
asked by mera
  1. Maximum elevator load = M*g, where M is the mass of passengers and/or freight.

    Require that
    (500 + M)*(g + a) = 1.5 * Tmax

    (500 + M)*12.05 = 29.4*10^3 N

    Solve for M.

    M = 2440 kg

    Divide M by 75 kg for the maximum number of people.

    1. 👍 0
    2. 👎 0
    posted by drwls
  2. a.)588.88 kg
    b.) 7

    1. 👍 0
    2. 👎 0
    posted by morgan

Respond to this Question

First Name

Your Response

Similar Questions

  1. statistics

    Please help with conditional probability problem? Over 50% of all engineers end up in management. An engineering firm needs project managers that understand the technical aspects of the product. A large firm is looking toward

    asked by Alex on January 23, 2019
  2. Math - Linear Equations

    "A trucking firm has 8 trucks, some carry a load of 10 tonnes and others carry a load of 5 tonnes. When all 8 trucks are carrying a full load, the total load is 70 tonnes." Develop and solve simultaneous equations to determine the

    asked by Kiirsty on May 23, 2014
  3. PHYSICS HELP!!

    A motorised gearbox has a reduction ratio of 50:1. The power input to the gearbox is 5 kW at 1440 RPM. The gearbox efficiency is 85% under maximum load conditions. The output shaft of the gearbox is attached to a winch drum of

    asked by baz on May 11, 2015
  4. PHYSICS HELP!!

    A motorised gearbox has a reduction ratio of 50:1. The power input to the gearbox is 5 kW at 1440 RPM. The gearbox efficiency is 85% under maximum load conditions. The output shaft of the gearbox is attached to a winch drum of

    asked by baz on May 12, 2015
  5. Physics

    The arm of a crane at a construction site is 13.1 m long, and it makes an angle of 20° with the horizontal. Assume that the maximum load the crane can handle is limited by the amount of torque the load produces at the base of the

    asked by Krista on March 21, 2011
  6. physics

    A string cn hold a maximum load of 500kg if it has a lenght of 5m and a load of 40kg. Calculate(a. The maximum linear velocity (b. The maximum angular velocity (c. The time taken to complete 1 revolution.

    asked by Fate on May 26, 2011
  7. Physics

    4. In a shopping mall, two elevators pass each other moving in opposite directions. Each elevator to the other is 10 m/s. What is the velocity of each elevator relative to a person standing on the ground? One elevator has a

    asked by Helga on August 27, 2018
  8. Economics

    Consider the problem of a firm that needs to decide how much output, denoted by x, to sell. The marginal revenue function of the firm is given by 10−x. It's marginal cost function is goven by x. In addition, the firm faces a

    asked by Kamini on January 6, 2015
  9. physical science

    the elevators in the landmark tower yokohama japan are among the fastest in the world. they accelerate upward at 3.125 m/s2 for 4.0 seconds to reach their final speed. if these elevators start at rest what is their final speed?

    asked by Anonymous on August 17, 2015
  10. Science

    Associate each item in the table with at least one field of science and one area of technology/engineering. Choose from the terms given at the bottom. Automobile aspirin shirt computer pesticide satellite robot atomic bomb

    asked by Roma on February 11, 2014

More Similar Questions