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. 👍 0
  2. 👎 0
  3. 👁 355
  1. aveagg

    1. 👍 0
    2. 👎 0
    posted by asdf

Respond to this Question

First Name

Your Response

Similar Questions

  1. Physics

    The efficiency of a pulley system is 47 percent. The pulleys are used to raise a mass of 47 kg to a height of 7.0 m. The acceleration of gravity is 9.81 m/s 2 . What force is exerted on the rope of the pulley system if the rope is

    asked by Madi on November 18, 2015
  2. physics

    The efficiency of a pulley system is 81 percent. The pulleys are used to raise a mass of 85 kg to a height of 8.5 m. The acceleration of gravity is 9.81 m/s^2. What force is exerted on the rope of the pulley system if the rope is

    asked by Anonymous on February 20, 2012
  3. 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

    asked by anonymous on January 17, 2007
  4. 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%

    asked by Emperor Sam on September 15, 2016
  5. Physics

    A system of pulleys is used to lift a load of 1000kg.if the efficiency of pulley system is 80%and velocity ratio is 20,find effort required to lift the load...............??

    asked by Anonymous on October 3, 2017
  6. Physics, please help me today.

    four pulleys are connected by two belts. Pulley A (radius 15cm) is the drive pulley and it rotates at 10 rad/s. Pulley B (radius 10 cm) is connected by belt 1 to pulley A. Pulley B' (radius 5cm) is concentric with pulley B and is

    asked by Dawn on November 17, 2006
  7. Physics

    How would you use a pulley system with one rope to pull at a single item at two points simultaneously? The free ropes of two block and tackle pulley systems could be joined to pull an object in two places. Or you could just hang a

    asked by Jason on June 13, 2007
  8. Physics

    A pulley system lifts a 500-lb block 1.0 foot with an effort of only 50 lb. If the 50 lb moves 30 feet, calculate the efficiency of the pulley system.

    asked by Isis on June 18, 2013
  9. Physics

    A pulley system os being used to raise a load. The rope begins at the ceilings, goes down, round a pulley on the load, up to a pulley on the ceiling, back down and around a second pulley on the load, and up to a sheave (a motor

    asked by Alex on July 15, 2012
  10. physics

    You exert a force of 455N in pulling 15.0m of rope using a pulley system to lift a 935N object 5.0m. What is the efficiency of the pulley system? Please help, I appreciate it a lot.

    asked by Cynthia on June 13, 2009

More Similar Questions