Math/Science
posted by Soraya .
Can someone please give an example of how i can use this formula in a word problem...
Percent efficiency=
Work out (J)
_____________ x100
Work in (J)

The electric motor that hauls our boats out of the water is 80% efficient.
the power out of the motor needed to haul the boat at .1 meter per second is 16 thousand Watts. How much power must go into the motor from the electric cable in the street?
Respond to this Question
Similar Questions

physics......PLEASE HELP!!
A steam engine absorbs 1.98*10^5 J and expels 1.49*10^5 J in each cycle. Assume that all of the remaining energy is used to do work. a. What is the engine's efficiency? 
physics
A theoretical gasoline engine runs with 76 percent efficiency. It is calculated that it expels 3.25*10^4 J of heat. a. Find the heat absorbed in one cycle. b. Find the work output in one cycle. All this comes from the definition of … 
Sciance/Math
How how can i turn this formula into a simple word problem... Percent efficiency(e)= Work out (J) _____________ x100 Work in (J) 
Math/Sciance
Can someone please give an example of how i can use this formula in a word problem... Work out (J) Percent efficiency(e)= ____________ x100 Work in (J) 
Physics
please show me how to work out this problem: A roller coaster moves 85 m horizontally, then travels 45 m at an angle of 30.0 degrees above the horizontal. what is its displacement from its starting point? 
science
Describe one way in which work is done (Reminder: For work to be done, the force and the distance must be in the same direction.). guitar, keyboard Can you give me an example of how to describe how work is done in one of these example … 
science
Describe one way in which work is done (Reminder: For work to be done, the force and the distance must be in the same direction.). guitar, keyboard Can you give me an example of how to describe how work is done in one of these example … 
English / Grammar
Please help me word this sentence correctly: At its zenith, the depression saw nearly 25 percent of all workers and 37 percent of all nonfarm workers completely out of work. I'm trying to say that at the peak of the depression, that's … 
Physics
A steamelectric power plant delivers 900 MW of electric power. The surplus heat is exhausted into a river with a flow of 2.91×105 kg/s, causing a change in temperature of 1.07 oC. A. What is the efficiency of the power plant? 
Physics 11
Can someone explain what work total is? In my lessons it said Work total is the sum of all work & showed an example of different work being added together. An assignment after that however made me think that may not be the case...