Add a calculated field named AccountTime that calculates the number of days each client's accounts have been open. Assume today'
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Answer:
The maximum length of the specimen before the deformation was 358 mm or 0.358 m.
Explanation:
The specific deformation ε for the material is:
(1)
Where δL and L represent the elongation and initial length respectively. From the HOOK's law we also now that for a linear deformation, the deformation and the normal stress applied relation can be written as:
(2)
Where E represents the elasticity modulus. By combining equations (1) and (2) in the following form:
So by calculating ε then will be possible to find L. The normal stress σ is computing with the applied force F and the cross-sectional area A:
Then de specific defotmation:
Finally the maximum specimen lenght for a elongation 0f 0.45 mm is:
Answer:
A) Not possible, B) Posible, C) Possible, D) Not possible.
Explanation:
The maximum theoretical efficiency for any thermal engine is defined by Carnot's cycle, whose energy efficiency (), no unit, is expressed below:
(1)
Where:
- Cold reservoir temperature, in Kelvin.
- Hot reservoir temperature, in Kelvin.
If we know that and
, then the maximum theoretical efficiency for the thermal engine is:
For real thermal engines, the following inequation is observed:
(2)
Where is the efficiency of the real heat engine, no unit.
There are two possible criteria to determine if a given heat engine is real:
Efficiency
(3)
Where:
- Heat rejected to the cold reservoir, in kilojoules.
- Heat received from the hot reservoir, in kilojoules.
Power output
(4)
Where is the power output, in kilojoules.
Now we proceed to verify each case:
A) ,
,
This engine is not possible.
B) ,
,
The engine is possible.
C) ,
,
The engine is possible.
D) ,
,
The engine is possible.