Me i need to pass

a machine has an efficiency of 80%. how much work must be done on the machine so to make it do 50,000 j of output work?

--a--12,500 j
--b--40,000 j
--c--62,500 j
--d--90,000 j

c. 62,500 J

Explanation: The ratio of output work to input work expressed as a percent is called as efficiency of the machine.

Given : Efficiency = 80 %

Output work or work done by the machine = 50000 J

Input work or work done on the machine = ?

kelp are large brown algae that live in cool, relatively shallow waters close to the shore. they grow in dense groupings much like a forest on land. these underwater towers of kelp provide food and shelter for thousands of fish, invertebrates, and marine mammal species.

e) all of the above