Answer:
The lumped body analysis is most applicable for slender bodies because Biot number is smaller for the slender bodies as compare to the well rounded bodies.
As we know that Biot number Bi ,given as
h= heat transfer coefficient
k= thermal conductivity
Lc=characteristic length
V=volume
A=area
When Bi is less than 0.1 then lumped body analysis is applicable.
The statements regarding the refrigeration system as expressed by the technicians are correct. Hence, the correct statement is Option c.
<h3>What is a refrigeration system?</h3>
Refrigeration systems are a crucial process in the industry and home applications as they carry out cooling or keep the room temperature at a preferred value.
The missing information in the question is:
A.technician A only
B.technician B only
C.both A and B
D.neither A or B
Hence, The statements regarding the refrigeration system as expressed by the technicians are correct. the correct statement is Option c.
Learn more about Refrigeration systems:
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Answer:
Entrepreneur's primary duty is to make money for himself and investors.
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Answer:
critical stress required for the propagation is 27.396615 × N/m²
Explanation:
given data
specific surface energy = 0.90 J/m²
modulus of elasticity E = 393 GPa = 393 × N/m²
internal crack length = 0.6 mm
to find out
critical stress required for the propagation
solution
we will apply here critical stress formula for propagation of internal crack
( σc ) = .....................1
here E is modulus of elasticity and γs is specific surface energy and a is half length of crack i.e 0.3 mm = 0.3 × m
so now put value in equation 1 we get
( σc ) =
( σc ) =
( σc ) = 27.396615 × N/m²
so critical stress required for the propagation is 27.396615 × N/m²
Answer:
1.) dV/dt = -187200πSin(120πt)
2.) No
3.) -187200
Explanation:
The voltage, V, in volts, in an electrical outlet is given as a function of time, t, in seconds, by the function V=156cos(120πt)
dV/dt = -187200πSin(120πt)
Since the rate of change above is negative, that is, its maximum is negative. definitely, it will never be equal to zero.
The maximum value of the rate of change will be its amplitude, which is
-187200