mayankdevnani
  • mayankdevnani
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
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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mayankdevnani
  • mayankdevnani
@amistre64 @ParthKohli @hartnn @Callsito @Zarkon @Hero @.Sam. @estudier @ganeshie8 @ajprincess @Algebraic!
mayankdevnani
  • mayankdevnani
@Callisto
amistre64
  • amistre64
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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anonymous
  • anonymous
May I help?
amistre64
  • amistre64
please do :)
mayankdevnani
  • mayankdevnani
ofcourse @SheldonEinstein
anonymous
  • anonymous
;) 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?
mayankdevnani
  • mayankdevnani
ok @amistre64 then
mayankdevnani
  • mayankdevnani
yaa
mayankdevnani
  • mayankdevnani
efficiency=winout/winin*100
mayankdevnani
  • mayankdevnani
right @SheldonEinstein
anonymous
  • anonymous
Yeah or in simpler words it is : \(\large{\frac{\textbf{Output}}{\textbf{Input}}\times 100}\) it is 100%...
mayankdevnani
  • mayankdevnani
yaa
anonymous
  • anonymous
So, what we have is output/input * 100% = 20% , correct?
mayankdevnani
  • mayankdevnani
correct
anonymous
  • anonymous
Ok so now, let me understand the second line of the quest. , is the output = 1000 calorie ?
mayankdevnani
  • mayankdevnani
yaa
mayankdevnani
  • mayankdevnani
then
mayankdevnani
  • mayankdevnani
@SheldonEinstein then
anonymous
  • anonymous
Oh sorry wait!
mayankdevnani
  • mayankdevnani
yaa
anonymous
  • anonymous
I am getting diff. answer so I am checking it, sorry , it will require some patience.
mayankdevnani
  • mayankdevnani
ok
anonymous
  • anonymous
Quest. is wrong
mayankdevnani
  • mayankdevnani
why?? no it is right
anonymous
  • anonymous
Time is not given.. though if you take 1 minute it is 200 cal.
mayankdevnani
  • mayankdevnani
yaa
anonymous
  • anonymous
See , Power = 1000 cal/minute (given)
anonymous
  • anonymous
use this and you will get 200 cal. as answer.
mayankdevnani
  • mayankdevnani
so what's the work done?
anonymous
  • anonymous
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
anonymous
  • anonymous
200 cal.... = WORK DONE
mayankdevnani
  • mayankdevnani
no
mayankdevnani
  • mayankdevnani
but the work done is in joule
mayankdevnani
  • mayankdevnani
@ParthKohli @Preetha
mayankdevnani
  • mayankdevnani
@SheldonEinstein
mayankdevnani
  • mayankdevnani
@myininaya
anonymous
  • anonymous
Is my answer correct, i.e. 200 cal, 873 J ?
mayankdevnani
  • mayankdevnani
yaa
anonymous
  • anonymous
So where is the problem? ?? ? ?
mayankdevnani
  • mayankdevnani
873 J how??
mayankdevnani
  • mayankdevnani
@amriju
mayankdevnani
  • mayankdevnani
@SheldonEinstein how you got it 873J
anonymous
  • anonymous
I got 200 Cal, and it is in options, soo....
mayankdevnani
  • mayankdevnani
but it's wrong
mayankdevnani
  • mayankdevnani
i need solution
mayankdevnani
  • mayankdevnani
can you help me @amriju
anonymous
  • anonymous
200 cal * 4.184 = 836 J (approx. ) not equal to 873 Joule , hence I think the options are wrong..
mayankdevnani
  • mayankdevnani
no it was not wrong
amriju
  • amriju
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
mayankdevnani
  • mayankdevnani
so 1cal.=? j @amriju
amriju
  • amriju
4.2...approx..the correct is 4.187...
mayankdevnani
  • mayankdevnani
is it 4.37
amriju
  • amriju
nope
mayankdevnani
  • mayankdevnani
why??
amriju
  • amriju
thats how it is defined...both are units...and 1 cal is defined as 4.187 joules...
anonymous
  • anonymous
That is what I was saying @amriju
mayankdevnani
  • mayankdevnani
in my solution book...the answer is as follows- \[\frac{20}{100}=\frac{W}{1000}=200 calorie\] OR \[200\times4.37=873J\]
mayankdevnani
  • mayankdevnani
is that right?? @amriju and @SheldonEinstein
anonymous
  • anonymous
That is wrong, 1 Cal. = 4.187 Joule NOT 4.37 joule...
mayankdevnani
  • mayankdevnani
ok... thnx... @SheldonEinstein and @amriju
amriju
  • amriju
u may jst check on wikipedia...and its seems that none of the options are correct...the closest being 200, 837
amistre64
  • amistre64
just for reference http://www.wolframalpha.com/input/?i=200+calorie+to+joule
amistre64
  • amistre64
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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