Homework Help: science

Posted by please help(: on Wednesday, November 4, 2009 at 1:06pm.

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 - drwls, Wednesday, November 4, 2009 at 1:12pm
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 - please help(:, Wednesday, November 4, 2009 at 1:44pm
so would i mult. 2000* .80 which gives me 1600?

Answer this Question

Related Questions

science - For a machine with an efficiency of 80%, what is the work output of ...
science - percentages: to use a machine,u must do the work on the machine called...
PHYSICAL - A SIMPLE MACHINE PRODUCE 25 JOULES, WHAT IS THE OUTPUT WORK FOR ...
Algebra - A machine has a work output of 28ax^5 joules and a work input of 7a^2x...
Physics - A machine is used to either do work or to convert energy. To find the ...
Health Physics - A machine is used to either do work or to convert energy. To ...
Health Physics - A machine is used to either do work or to convert energy. To ...
Physics - As a result of doing work, a person supplies a machine with 1100 J of ...
Health Physics - As a result of doing work, a person supplies a machine with ...
Algebra - I have an input / output machine I need a rule I can use for any value...

For Further Reading

First Name:
School Subject:
Answer: