Physics

1. The efficiency of a squeaky pulley system is 73 percent. The pulleys are used to raise a mass to a certain height. What force is exerted on the machine if a rope is pulled 18.0 m in order to raise a 58 kg mass a height of 3.0 m?

So to find the force exerted do I just do 58*3*0.73/18 = 7.06 kg ????

2. A person lifts a 950 N box by pushing it up an incline. If the person exerts a force of 350 N along the incline, what is the mechanical advantage of the incline?

What do I do to solve this?



1. No. Force is not in kg, it is Newtons.

WorkdoneOnGravity= 58*g*3
Workdone by person= Force*18

Workdonebyperson*.73= workdone on gravity.

2. The definition MA:
Ma= force output/forceinput= 950/350

  1. 👍
  2. 👎
  3. 👁
  1. aveagg

    1. 👍
    2. 👎

Respond to this Question

First Name

Your Response

Similar Questions

  1. Physics

    A block and tackle system of pulleys consisting of 4 pulleys is used to raise a load of 50N through a height of 20m If the total workdone against friction in the pulleys is equivalent to 800j Calculate I.Total workdone by the

  2. Physics

    Mechanical Advantage The pulley system shown in the figure is used to lift a m= 67-kg crate. Note that one chain connects the upper pulley to the ceiling and a second chain connects the lower pulley to the crate. Assume the masses

  3. mabathoana high school maseru

    A block and tackle system of 5 pulley is used to raise a load of 500N steady through a height of 20m the work done against friction is then 2000J. Calculate the work done By effort, efficiency and effort applied

  4. physics

    1. The efficiency of a squeaky pulley system is 73 percent. The pulleys are used to raise a mass to a certain height. What force is exerted on the machine if a rope is pulled 18.0 m in order to raise a 58 kg mass a height of 3.0

  1. Physics

    A block and tackle system of pulleys consisting of 5 pulleys is used to raise a load of 500 N through a height of 12m. If the total work done by the system is 7200 J. calculate the 1. Work done against friction 2. Efficiency of

  2. Science

    A pulley system having 5 pulleys is used to raise a 450N load. find the mechanical advatange and hence the effort if the efficiency is 75%

  3. Physics

    A pulley system has a velocity ratio of 4 and an efficiency of 80%.calculate the value of the effort required to raise the load of 480N

  4. Physics

    A pulley system is used to lift a piano 2.6 m. If a force of 2510 is applied to the rope as the rope is pulled in 14 m, what is the efficiency of the machine? Assume the mass of the piano is 750 kg. I know the equation is eff =

  1. Physics

    A block and tackle system of 5 pulleys is used to raise a load of 500N steadily through a height of 20m.The work done against friction is then 2000J.Calculate the efficiency of the system.

  2. Physics

    A block and tacle of 6 pulley is used to raise a load of 300n steadily through a height of 30m if the workdone against friction is 2000j. calculate the workdone by the effort,the applied effort,the efficiency of the system

  3. math

    The 2 pulleys in the figure have radii of 15 cm and 8 cm, respectively. The larger pulley rotates 25 times in 36 seconds find the angular velocity of each pulley in radians per second. Find angular velocity of each pulley in

  4. Physics

    A pulley system has an efficiency of 87.5%. How much rope must be pulled if a force of 648N is needed to lift a 105 kg desk 2.46m?

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