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A thermos bottle containing coffee is vigorously shaken and thereby the temperature of coffee rises. Regard the coffee as the system.
Select one or more:
Select one or more:
- a)W = –ve
- b)Q = 0
- c)ΔU = +ve
- d)W = +ve
Correct answer is option 'A,B,C'. Can you explain this answer?
Verified Answer
A thermos bottle containing coffee is vigorously shaken and thereby th...
The heat has not been transferred to coffee which is thermally insulated by shaking, work has been done on coffee (system) against the viscous forces in it.
According to first law,
ΔU = Q – W
Here Q = 0
And W is negative as work is done on the system so that
ΔU = 0 – (–W)
i.e. ΔU is positive. The internal energy of system (coffee) increases.
Q = 0, W = -ve, ΔU = +ve
The correct answers are: Q = 0, W = –ve, ΔU = +ve
According to first law,
ΔU = Q – W
Here Q = 0
And W is negative as work is done on the system so that
ΔU = 0 – (–W)
i.e. ΔU is positive. The internal energy of system (coffee) increases.
Q = 0, W = -ve, ΔU = +ve
The correct answers are: Q = 0, W = –ve, ΔU = +ve
Most Upvoted Answer
A thermos bottle containing coffee is vigorously shaken and thereby th...
Work is done on the coffee by shaking the thermos bottle.
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A thermos bottle containing coffee is vigorously shaken and thereby the temperature of coffee rises. Regard the coffee as the system.Select one or more:a)W = –veb)Q = 0c)ΔU = +ved)W = +veCorrect answer is option 'A,B,C'. Can you explain this answer?
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