Physics

Fig.19 shows a crane lifting a car of mass 850 kg at constant velocity through a height of 12m in a time of 40s. The crane has a working efficiency of 60%.
i) Calculate the tension in the lifting cable (in N)
ii) Calculate the total input power required by the crane to lift the car (in W)
iii) Suggest and explain many ways the crane can be modified to improve its efficiency

Please show all working out with no abbreviations but full equations used. Please help I’m stuck!

  1. 👍 0
  2. 👎 0
  3. 👁 1,175
  1. I. F = M*g = 850 * 9.8 = 8330 N. = Tension in the cable.

    II. Po = F*d/t = 8330 * 12/40 = 2499 J./s = 2499 Watts. = Power out.

    Pin = Po/Eff. = 2499/0.60 = 4165 Watts.
    = Input power.

    1. 👍 1
    2. 👎 1
  2. Henry what are the equations you used fully written out in words as the abbreviations used are different in my school so please tell me the full words please

    1. 👍 0
    2. 👎 0
  3. I will give you the meaning of the abbreviations, but you will have to write them into the equations.

    F = Force in newtons.

    2. M = Mass in kilograms.

    3. g = Acceleration due to gravity in m/s^2.

    4. d = Distance in meters.

    5. J = Joules.

    6. s = Time in seconds.

    7. Pin = Power input.

    8. Eff. = Efficiency.

    1. 👍 1
    2. 👎 0

Respond to this Question

First Name

Your Response

Similar Questions

  1. Help me with science please

    Which statement includes a description of velocity?(1 point) A marble rolls 30 centimeters away from the table. A car travels east at 45 kilometers per hour. A bicycle moves 8 meters per second. A student walks 20 meters down the

  2. PHYSICS

    Fig. 6-48 shows a conical pendulum, in which the bob (the small object at the lower end of the cord) moves in a horizontal circle at constant speed. (The cord sweeps out a cone as the bob rotates.) The bob has a mass of 0.038 kg,

  3. physics

    several students are riding in bumper cars at an amusement park. the combined mass of a car A and its occupants is 250 kg. the combined mass of car B and its occupants is 200 kg. Car A is 15 m away from car B and moving to the

  4. physics

    a magnetic crane left a mass 1500 through a vertical height of 40m.calculate the work done in operating the crane

  1. Physics

    Question 2. 3 Consider a box that explodes into two pieces while moving with Fig. 9-24 a constant positive velocity along an x axis. If one piece, with mass : m1, ends up with positive velocity v1, then the second piece, with :

  2. physics

    What is the work done by a crane to lift a 500kg beam over a height of 50.0m? Assume the crane lifts the beam at a constant velocity.

  3. physics

    A block of mass 0.8 kg is dragged along a level surface at constant velocity by a hanging block of mass 0.2 kg as shown in fig. 2.29. Find tension in the string and acceleration of the system, if the coefficient of friction

  4. Physics

    Two cars collide at an icy intersection and stick together afterward. The first car has a mass of 1200 kg and is approaching at 8.00 m/s due south. The second car has a mass of 850 kg and is approaching at 17.0 m/s due west. (a)

  1. physics

    Two cars cover the same distance in a straight line. Car A covers the distance at a constant velocity. Car B starts from rest and maintains a constant acceleration. Both cars cover a distance of 487 m in 216 s. Assume that they

  2. Physics

    Car 1 has a mass of m1 = 65 103 kg and moves at a velocity of v01 = +0.78 m/s. Car 2, with a mass of m2 = 92 103 kg and a velocity of v02 = +1.4 m/s, overtakes car 1 and couples to it. Neglect the effects of friction in your

  3. Physics

    The speed time graph shows the motion of a car over a period of 40 seconds. a. describe the motion of the car between: 1.) O and A - The car is traveling at constant speed from 0 to 20 m/s. 2.) A and B - The car is at rest for 20

  4. physics

    3 Fig. 3.1 shows the arm of a crane when it is lifting a heavy box. Fig. 3.1 (a) By the use of a scale diagram (not calculation) of the forces acting at P, find the weight of the box. [5]

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