Answer:
a) The schematic illustrating is attached
b) The heat transfer to the heat engine is 2142.86 kJ, the heat transfer from the heat engine is 1392.86 kJ
c) The heat transfer to the heat engine is 1648.35 kJ, the heat transfer from the heat engine is 898.35 kJ
Explanation:
b) The heat transfer to the engine and the heat transfer from the engine to the air is:
![Q_{1} =\frac{W}{n}](https://tex.z-dn.net/?f=Q_%7B1%7D%20%3D%5Cfrac%7BW%7D%7Bn%7D)
Where
W = 750 kJ
n = 35% = 0.25
Replacing:
![Q_{1} =\frac{750}{0.35} =2142.86kJ](https://tex.z-dn.net/?f=Q_%7B1%7D%20%3D%5Cfrac%7B750%7D%7B0.35%7D%20%3D2142.86kJ)
![Q_{2} =Q_{1} -W=2142.86-750=1392.86kJ](https://tex.z-dn.net/?f=Q_%7B2%7D%20%3DQ_%7B1%7D%20-W%3D2142.86-750%3D1392.86kJ)
c) The efficiency of Carnot engine is:
![n=1-\frac{300K}{550K} =0.455](https://tex.z-dn.net/?f=n%3D1-%5Cfrac%7B300K%7D%7B550K%7D%20%3D0.455)
The heat transfer to the heat engine is:
![Q_{1c} =\frac{750}{0.455} =1648.35kJ](https://tex.z-dn.net/?f=Q_%7B1c%7D%20%3D%5Cfrac%7B750%7D%7B0.455%7D%20%3D1648.35kJ)
The heat transfer from the heat engine is:
![Q_{2c} =1648.35-750=898.35kJ](https://tex.z-dn.net/?f=Q_%7B2c%7D%20%3D1648.35-750%3D898.35kJ)
Answer:
I think it’s b
Explanation:
Average speed is calculated by dividing the total distance that something has traveled by the total amount of time it took it to travel that distance. Speed is how fast something is going at a particular moment. Average speed measures the average rate of speed over the extent of a trip.
Answer:
true
Explanation:
because u will use more force to start an object rather than to push moving object
Answer:
Correct answer: m = 1,160 kg
Explanation:
Given:
P = 104 hp = 77.48 kW = 77.48 · 10³ W
V₁ = 21 m/s Initial speed (velocity)
V₂ = 29 m/s Final speed (velocity)
t = 3 seconds The time interval during which the work was performed
m = ?
The formula for calculating power is:
P = A / Δt
Since work is a measure of energy change in this case kinetic:
P = ΔEk / Δt = (Ek₂ - Ek₁) / Δt = (m V₂²/ 2 - m V₁²/ 2) / Δt
P = m · (V₂² - V₁²) / 2 · Δt ⇒ m = (2 · P · Δt) / (V₂² - V₁²)
m = (2 · 77.48 · 10³ · 3) / (29² - 21²) = 464.88 · 10³ / (841 - 441)
m = 464.88 · 10³ / 400 = 1.16 · 10³ = 1,160 kg
m = 1,160 kg
God is with you!!!