science

posted by .

For a machine with an efficiency of 80%, what is the work output of the machine if its work input is 2,000 joules?

would i divide 2000/.80? which gives me 2500?

Also,
If a machine requires an effort force of 750 newtons applied over a distance of 2 meters, over what resistance distance is the machine acting if the resistance force has a value of 150 newtons? Assume that it is an ideal machine. (HINT: Use the equation Fe x de = F r x dr)
A 5 meters
B 10 meters
C 150 meters
D 300 meters

can you help me set up the equation cause im lossttt! please(:

  • science -

    No to your first question. You can't get more work out than you put in.

    Second question: For a 100% efficient machine, the product of force x distance is the same for the input (effort) as the output (resistance). That is the equation they told you to use. So, use it. You want to solve for the resistance distance dr

    dr = Fe*de/Fr = 750*2/150 = ? meters

  • DRWLS -

    so would i mult. 2000* .80 which gives me 1600?

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. science

    percentages: to use a machine,u must do the work on the machine called input work. the machine then foes the work on and object called output work. not all the input work gets transmitted to output work. some work is lost due to friction …
  2. science

    For a machine with an efficiency of 80%, what is the work output of the machine if its work input is 2,000 joules?
  3. Health Physics

    A machine is used to either do work or to convert energy. To find the efficiency of a machine, one must compare the power input to the machine to the power output of the machine. What does thepower take into account in addition to …
  4. Health Physics

    A machine is used to either do work or to convert energy. To find the efficiency of a machine, one must compare the power input to the machine to the power output of the machine. What does thepower take into account in addition to …
  5. Physics

    A machine is used to either do work or to convert energy. To find the efficiency of a machine, one must compare the power input to the machine to the power output of the machine. What does thepower take into account in addition to …
  6. Algebra

    A machine has a work output of 28ax^5 joules and a work input of 7a^2x^6 joules. What is the efficiency of the machine?
  7. PHYSICAL

    A SIMPLE MACHINE PRODUCE 25 JOULES, WHAT IS THE OUTPUT WORK FOR EVERY 50 JOULES OF INPUT WORK. WHAT IS THE EFFICIENCY OF THIS MACHINE?
  8. Physics

    elbow raises a 1200 N piano a distance of 5 meters using a set of pulleys. elbow pulls in 20.0 meter of rope while exerting a force of 340 N. a) what is the work output?
  9. Agosec Ghana

    a machine was used to lift a load of 30N through a distance of 2metres. the effort applied was 10N through a distance of 8metres. calculate the. A) mechanical advantage B) work input of the machine C) work output of the machine D) …
  10. Science-y Math-y Stuff

    A machine with 80% efficiency does 4,000 J of work. Using the machine how much work did you do?

More Similar Questions