Answer:
Explanation:
Kelvin's climbing represents the <em>absolute temperature</em>. Temperature is a measure of the molecular kinetic energy of translation. If the molecules move quickly, with the same energy as in the walls of the container, which makes us feel like "heat". If the molecules do not move, the temperature is zero. 0 K.
The Celsius scale has an <em>artificial zero</em>, defined in the solidification temperature of the water. It is very useful to talk about the weather, and about some simpler technical matters. But it is artificial.
Answer:
c is the answer because we have to double the number
Answer:
From first law of thermodynamics(energy conservation)
Qa= Qr+W
Qa=Heat added to the engine
Qr=heat rejected from the engine
W=work output from the engine
Second law:
It is impossible to construct a heat engine that will deliver the work with out rejecting heat.
In other word ,if engine take heat then it will reject some amount heat and will deliver some amount of work.
1.
QH=6 kW,
QL=4 kW,
W=2 kW
6 KW= 4 + 2 KW
It satisfy the first law.
Here heat is also rejected from the engine that is why it satisfy second law.
2.
QH=6 kW, QL=0 kW, W=6 kW
This satisfy first law but does not satisfy second law because heat rejection is zero.
3.
QH=6 kW , QL=2 kW, W=5 kW
This does not satisfy first as well as second law.Because summation of heat rejection and work can not be greater than heat addition or we can say that energy is not conserve.
4.
QH=6 kW, QL=6 kW, W=0 kW
This satisfy first law only and does not satisfy second law.
Answer:
Δr=20.45 %
Explanation:
Given that
Rake angle α = 15°
coefficient of friction ,μ = 0.15
The friction angle β
tanβ = μ
tanβ = 0.15
β=8.83°
2φ + β - α = 90°
φ=Shear angle
2φ + 8.833° - 15° = 90°
φ = 48.08°
Chip thickness r given as
r=0.88
New coefficient of friction ,μ' = 0.3
tanβ' = μ'
tanβ' = 0.3
β'=16.69°
2φ' + β' - α = 90°
φ'=Shear angle
2φ' + 16.69° - 25° = 90°
φ' = 49.15°
Chip thickness r' given as
r'=0.70
Percentage change
Δr=20.45 %
Answer:
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