Question

2 more question:

1.
If you have a device that has an energy efficiency of 0.4 and you put in 100 units of energy, how many units of useful energy will you get out of it?
A. 0.4
B. 4
C. 40
2.
The human body has an energy efficiency of:
A. 5%
B. 50%
C. 75%
D. 100%

thankyou!

Answer 1

1.
\[\eta_{th} ={W_{out}\over Q _{in} }\]\[Q _{in} \times \eta_{th} ={W_{out} }\]
\[100u \times 0.4 =W_{out}=40u\]

Answer 2

thankyou so much for all yer help uve given me:0 and the answer to the other question is A.:)

Answer 3

that would be my guess ,