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A steam engine has an efficiency of 20%.It is given an energy of 1000 cal.per minute.What is the actual work done by it in joule and in calories? a) 100 cal,800 J b) 200 cal,873 J c)10 cal,80 J d)100 cal,100 J

Physics
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im not sure since we havent gone over this in my physics class yet, but i would say that 20% efficiency means that 20% of the 1000 cals are used; giving us 200 cals in the answer at least

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Other answers:

May I help?
please do :)
;) OK so first of all what @amistre64 discussed in his previous comment is very imp. to do this quest., so @mayankdevnani do you know what does efficiency mean?
ok @amistre64 then
yaa
efficiency=winout/winin*100
Yeah or in simpler words it is : \(\large{\frac{\textbf{Output}}{\textbf{Input}}\times 100}\) it is 100%...
yaa
So, what we have is output/input * 100% = 20% , correct?
correct
Ok so now, let me understand the second line of the quest. , is the output = 1000 calorie ?
yaa
then
Oh sorry wait!
yaa
I am getting diff. answer so I am checking it, sorry , it will require some patience.
ok
Quest. is wrong
why?? no it is right
Time is not given.. though if you take 1 minute it is 200 cal.
yaa
See , Power = 1000 cal/minute (given)
use this and you will get 200 cal. as answer.
so what's the work done?
W = P * time if T = 1 second , W = P ... that's it , find P(output) .. (using efficiency = Ouput/Input *100%) in Cal. per minute , that will be your answer
200 cal.... = WORK DONE
no
but the work done is in joule
Is my answer correct, i.e. 200 cal, 873 J ?
yaa
So where is the problem? ?? ? ?
873 J how??
@SheldonEinstein how you got it 873J
I got 200 Cal, and it is in options, soo....
but it's wrong
i need solution
can you help me @amriju
200 cal * 4.184 = 836 J (approx. ) not equal to 873 Joule , hence I think the options are wrong..
no it was not wrong
work done is 20 percnt of the energy given...thats efficiency....so per minute is 20percnt of 1000 cal...thats 200 cal...convert to joules
so 1cal.=? j @amriju
4.2...approx..the correct is 4.187...
is it 4.37
nope
why??
thats how it is defined...both are units...and 1 cal is defined as 4.187 joules...
That is what I was saying @amriju
in my solution book...the answer is as follows- \[\frac{20}{100}=\frac{W}{1000}=200 calorie\] OR \[200\times4.37=873J\]
is that right?? @amriju and @SheldonEinstein
That is wrong, 1 Cal. = 4.187 Joule NOT 4.37 joule...
ok... thnx... @SheldonEinstein and @amriju
u may jst check on wikipedia...and its seems that none of the options are correct...the closest being 200, 837
just for reference http://www.wolframalpha.com/input/?i=200+calorie+to+joule
if your options are truely: 200,873 then its most likely a typo and prolly meant to be read as 200,837

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