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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
 one year ago
 one year ago
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
 one year ago
 one year ago

This Question is Closed

mayankdevnaniBest ResponseYou've already chosen the best response.1
@amistre64 @ParthKohli @hartnn @Callsito @Zarkon @Hero @.Sam. @estudier @ganeshie8 @ajprincess @Algebraic!
 one year ago

amistre64Best 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
 one year ago

mayankdevnaniBest ResponseYou've already chosen the best response.1
ofcourse @SheldonEinstein
 one year ago

SheldonEinsteinBest 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?
 one year ago

mayankdevnaniBest ResponseYou've already chosen the best response.1
ok @amistre64 then
 one year ago

mayankdevnaniBest ResponseYou've already chosen the best response.1
efficiency=winout/winin*100
 one year ago

mayankdevnaniBest ResponseYou've already chosen the best response.1
right @SheldonEinstein
 one year ago

SheldonEinsteinBest 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%...
 one year ago

SheldonEinsteinBest ResponseYou've already chosen the best response.3
So, what we have is output/input * 100% = 20% , correct?
 one year ago

SheldonEinsteinBest 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 ?
 one year ago

mayankdevnaniBest ResponseYou've already chosen the best response.1
@SheldonEinstein then
 one year ago

SheldonEinsteinBest ResponseYou've already chosen the best response.3
Oh sorry wait!
 one year ago

SheldonEinsteinBest ResponseYou've already chosen the best response.3
I am getting diff. answer so I am checking it, sorry , it will require some patience.
 one year ago

SheldonEinsteinBest ResponseYou've already chosen the best response.3
Quest. is wrong
 one year ago

mayankdevnaniBest ResponseYou've already chosen the best response.1
why?? no it is right
 one year ago

SheldonEinsteinBest ResponseYou've already chosen the best response.3
Time is not given.. though if you take 1 minute it is 200 cal.
 one year ago

SheldonEinsteinBest ResponseYou've already chosen the best response.3
See , Power = 1000 cal/minute (given)
 one year ago

SheldonEinsteinBest ResponseYou've already chosen the best response.3
use this and you will get 200 cal. as answer.
 one year ago

mayankdevnaniBest ResponseYou've already chosen the best response.1
so what's the work done?
 one year ago

SheldonEinsteinBest 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
 one year ago

SheldonEinsteinBest ResponseYou've already chosen the best response.3
200 cal.... = WORK DONE
 one year ago

mayankdevnaniBest ResponseYou've already chosen the best response.1
but the work done is in joule
 one year ago

mayankdevnaniBest ResponseYou've already chosen the best response.1
@ParthKohli @Preetha
 one year ago

mayankdevnaniBest ResponseYou've already chosen the best response.1
@SheldonEinstein
 one year ago

SheldonEinsteinBest ResponseYou've already chosen the best response.3
Is my answer correct, i.e. 200 cal, 873 J ?
 one year ago

SheldonEinsteinBest ResponseYou've already chosen the best response.3
So where is the problem? ?? ? ?
 one year ago

mayankdevnaniBest ResponseYou've already chosen the best response.1
@SheldonEinstein how you got it 873J
 one year ago

SheldonEinsteinBest ResponseYou've already chosen the best response.3
I got 200 Cal, and it is in options, soo....
 one year ago

mayankdevnaniBest ResponseYou've already chosen the best response.1
can you help me @amriju
 one year ago

SheldonEinsteinBest 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..
 one year ago

mayankdevnaniBest ResponseYou've already chosen the best response.1
no it was not wrong
 one year ago

amrijuBest 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
 one year ago

mayankdevnaniBest ResponseYou've already chosen the best response.1
so 1cal.=? j @amriju
 one year ago

amrijuBest ResponseYou've already chosen the best response.0
4.2...approx..the correct is 4.187...
 one year ago

amrijuBest 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...
 one year ago

SheldonEinsteinBest ResponseYou've already chosen the best response.3
That is what I was saying @amriju
 one year ago

mayankdevnaniBest 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 \[200\times4.37=873J\]
 one year ago

mayankdevnaniBest ResponseYou've already chosen the best response.1
is that right?? @amriju and @SheldonEinstein
 one year ago

SheldonEinsteinBest ResponseYou've already chosen the best response.3
That is wrong, 1 Cal. = 4.187 Joule NOT 4.37 joule...
 one year ago

mayankdevnaniBest ResponseYou've already chosen the best response.1
ok... thnx... @SheldonEinstein and @amriju
 one year ago

amrijuBest 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
 one year ago

amistre64Best ResponseYou've already chosen the best response.0
just for reference http://www.wolframalpha.com/input/?i=200+calorie+to+joule
 one year ago

amistre64Best 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
 one year ago
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