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

Question

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(:

drwls · Answer

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

please help(: · Answer

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

sabrina · Answer

This doesnt answer my question can someone on here please answer me question i am having a really hard time with my test in cyberschool