Answer:
S = 172.69 J/K
Explanation:
For a closed system, the entropy is given as the natural logarithm of microstates.
The number of particles (grains of sand); N = 25
The number of boxes (compartments); M = 1000
Entropy is the logarithm of number of microstates; Thus,
S = In ψ
However, the number of microstates is given by the formula;
ψ = Mⁿ
Thus, S = In Mⁿ
Plugging in the relevant values to obtain;
S = In (1000)^(25)
S = 172.69 J/K
Answer Explanation : The general principles for design for assembly (DFA) are,
- MINIMIZE NUMBER OF COMPONENT
- USE STANDARD COMMERCIALLY AVAILABLE COMPONENTS
- USE COMMON PARTS ACROSS PRODUCT LINES
- DESIGN FOR EASE OF PART FABRICATION
- DESIGN PARTS WITH TOLERANCE THAT ARE WITHIN PROCESS CAPABILITY
- MINIMIZE USE OF FLEXIBLE COMPONENT
- DESIGN FOR EASE OF ASSEMBLY
- USE MODULAR DESIGN
- REDUCE ADJUSTMENT REQUIRED
STEPS TO MINIMIZE THE NUMBER OF PARTS
- USE OF INCORPORATE HINGS
- USE OF INTEGRAL SPRINGS
- USE OF SNAP FITS
- USE OF GUIDES BEARINGS
- USE OF COVERS
Answer:
Explanation:
=10°C,
=93.33°C
Q=500 btu=527.58 KJ
If we assume that air is ideal gas PV=mRT, ΔU=
Actually this is closed system so work will be zero.
Now fro first law
Q=ΔU=+W
⇒Q=
527.58 =
m=4.9kg
PV=mRT
(
)
Answer: CARDINALITY RATIO AND PARTICIPATION
ADVANTAGE
CARDINALITY RATIO
(THEY ARE USED TO SIMPLIFY DESIGNS)
DISADVANTAGE OF CARDINALITY RATIO IS THAT
(YOU CAN NOT SPECIFY A GIVEN NUMBER TO BE MAXIMUM)
ADVANTAGE OF PARTICIPATION CONSTRAINT IS THAT
(IT SHOWS WETHER THE EXISTENCE OF AN ENTITY IS DEPENDENT ON ITS RELATIONSHIPS WITH ANOTHER ENTITY)
DISADVANTAGE OF PARTICIPATION CONSTRAINT
(IT IS A COSTLY AFFAIR USING BOTH MODELS TO EXPRESEE RELATIONSHIPS).
Explanation:CARDINALITY RATIO specifies that maximum number of relationships an entity can engage itself in.
Participation constraint is a constraint that
Specifies whether the existence of an entity depends on its Relationships to another entity, it specifies the the minimum number of relationship instances that an entity can participate in
It is also minimum cardinality constraint,it has two types named as Total participation and partial participation.
