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mayankdevnani
Group Title
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
 2 years ago
 2 years ago
mayankdevnani Group Title
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
 2 years ago
 2 years ago

This Question is Closed

mayankdevnani Group TitleBest ResponseYou've already chosen the best response.1
@amistre64 @ParthKohli @hartnn @Callsito @Zarkon @Hero @.Sam. @estudier @ganeshie8 @ajprincess @Algebraic!
 2 years ago

mayankdevnani Group TitleBest ResponseYou've already chosen the best response.1
@Callisto
 2 years ago

amistre64 Group TitleBest ResponseYou've already chosen the best response.0
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
 2 years ago

SheldonEinstein Group TitleBest ResponseYou've already chosen the best response.3
May I help?
 2 years ago

amistre64 Group TitleBest ResponseYou've already chosen the best response.0
please do :)
 2 years ago

mayankdevnani Group TitleBest ResponseYou've already chosen the best response.1
ofcourse @SheldonEinstein
 2 years ago

SheldonEinstein Group TitleBest ResponseYou've already chosen the best response.3
;) 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?
 2 years ago

mayankdevnani Group TitleBest ResponseYou've already chosen the best response.1
ok @amistre64 then
 2 years ago

mayankdevnani Group TitleBest ResponseYou've already chosen the best response.1
efficiency=winout/winin*100
 2 years ago

mayankdevnani Group TitleBest ResponseYou've already chosen the best response.1
right @SheldonEinstein
 2 years ago

SheldonEinstein Group TitleBest ResponseYou've already chosen the best response.3
Yeah or in simpler words it is : \(\large{\frac{\textbf{Output}}{\textbf{Input}}\times 100}\) it is 100%...
 2 years ago

SheldonEinstein Group TitleBest ResponseYou've already chosen the best response.3
So, what we have is output/input * 100% = 20% , correct?
 2 years ago

mayankdevnani Group TitleBest ResponseYou've already chosen the best response.1
correct
 2 years ago

SheldonEinstein Group TitleBest ResponseYou've already chosen the best response.3
Ok so now, let me understand the second line of the quest. , is the output = 1000 calorie ?
 2 years ago

mayankdevnani Group TitleBest ResponseYou've already chosen the best response.1
@SheldonEinstein then
 2 years ago

SheldonEinstein Group TitleBest ResponseYou've already chosen the best response.3
Oh sorry wait!
 2 years ago

SheldonEinstein Group TitleBest ResponseYou've already chosen the best response.3
I am getting diff. answer so I am checking it, sorry , it will require some patience.
 2 years ago

SheldonEinstein Group TitleBest ResponseYou've already chosen the best response.3
Quest. is wrong
 2 years ago

mayankdevnani Group TitleBest ResponseYou've already chosen the best response.1
why?? no it is right
 2 years ago

SheldonEinstein Group TitleBest ResponseYou've already chosen the best response.3
Time is not given.. though if you take 1 minute it is 200 cal.
 2 years ago

SheldonEinstein Group TitleBest ResponseYou've already chosen the best response.3
See , Power = 1000 cal/minute (given)
 2 years ago

SheldonEinstein Group TitleBest ResponseYou've already chosen the best response.3
use this and you will get 200 cal. as answer.
 2 years ago

mayankdevnani Group TitleBest ResponseYou've already chosen the best response.1
so what's the work done?
 2 years ago

SheldonEinstein Group TitleBest ResponseYou've already chosen the best response.3
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
 2 years ago

SheldonEinstein Group TitleBest ResponseYou've already chosen the best response.3
200 cal.... = WORK DONE
 2 years ago

mayankdevnani Group TitleBest ResponseYou've already chosen the best response.1
but the work done is in joule
 2 years ago

mayankdevnani Group TitleBest ResponseYou've already chosen the best response.1
@ParthKohli @Preetha
 2 years ago

mayankdevnani Group TitleBest ResponseYou've already chosen the best response.1
@SheldonEinstein
 2 years ago

mayankdevnani Group TitleBest ResponseYou've already chosen the best response.1
@myininaya
 2 years ago

SheldonEinstein Group TitleBest ResponseYou've already chosen the best response.3
Is my answer correct, i.e. 200 cal, 873 J ?
 2 years ago

SheldonEinstein Group TitleBest ResponseYou've already chosen the best response.3
So where is the problem? ?? ? ?
 2 years ago

mayankdevnani Group TitleBest ResponseYou've already chosen the best response.1
873 J how??
 2 years ago

mayankdevnani Group TitleBest ResponseYou've already chosen the best response.1
@amriju
 2 years ago

mayankdevnani Group TitleBest ResponseYou've already chosen the best response.1
@SheldonEinstein how you got it 873J
 2 years ago

SheldonEinstein Group TitleBest ResponseYou've already chosen the best response.3
I got 200 Cal, and it is in options, soo....
 2 years ago

mayankdevnani Group TitleBest ResponseYou've already chosen the best response.1
but it's wrong
 2 years ago

mayankdevnani Group TitleBest ResponseYou've already chosen the best response.1
i need solution
 2 years ago

mayankdevnani Group TitleBest ResponseYou've already chosen the best response.1
can you help me @amriju
 2 years ago

SheldonEinstein Group TitleBest ResponseYou've already chosen the best response.3
200 cal * 4.184 = 836 J (approx. ) not equal to 873 Joule , hence I think the options are wrong..
 2 years ago

mayankdevnani Group TitleBest ResponseYou've already chosen the best response.1
no it was not wrong
 2 years ago

amriju Group TitleBest ResponseYou've already chosen the best response.0
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
 2 years ago

mayankdevnani Group TitleBest ResponseYou've already chosen the best response.1
so 1cal.=? j @amriju
 2 years ago

amriju Group TitleBest ResponseYou've already chosen the best response.0
4.2...approx..the correct is 4.187...
 2 years ago

mayankdevnani Group TitleBest ResponseYou've already chosen the best response.1
is it 4.37
 2 years ago

mayankdevnani Group TitleBest ResponseYou've already chosen the best response.1
why??
 2 years ago

amriju Group TitleBest ResponseYou've already chosen the best response.0
thats how it is defined...both are units...and 1 cal is defined as 4.187 joules...
 2 years ago

SheldonEinstein Group TitleBest ResponseYou've already chosen the best response.3
That is what I was saying @amriju
 2 years ago

mayankdevnani Group TitleBest ResponseYou've already chosen the best response.1
in my solution book...the answer is as follows \[\frac{20}{100}=\frac{W}{1000}=200 calorie\] OR \[200\times4.37=873J\]
 2 years ago

mayankdevnani Group TitleBest ResponseYou've already chosen the best response.1
is that right?? @amriju and @SheldonEinstein
 2 years ago

SheldonEinstein Group TitleBest ResponseYou've already chosen the best response.3
That is wrong, 1 Cal. = 4.187 Joule NOT 4.37 joule...
 2 years ago

mayankdevnani Group TitleBest ResponseYou've already chosen the best response.1
ok... thnx... @SheldonEinstein and @amriju
 2 years ago

amriju Group TitleBest ResponseYou've already chosen the best response.0
u may jst check on wikipedia...and its seems that none of the options are correct...the closest being 200, 837
 2 years ago

amistre64 Group TitleBest ResponseYou've already chosen the best response.0
just for reference http://www.wolframalpha.com/input/?i=200+calorie+to+joule
 2 years ago

amistre64 Group TitleBest ResponseYou've already chosen the best response.0
if your options are truely: 200,873 then its most likely a typo and prolly meant to be read as 200,837
 2 years ago
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