Answer:
Explanation:
Given that,
Efficiency of Carnot engine is 47%
η =47%=0.47
The wasted heat is at temp 60°F
TL=60°F
Rate of heat wasted is 800Btu/min
Therefore, rate of heat loss QL is
QL' = 800×60 =48000
The power output is determined from rate of heat obtained from the source and rate of wasted heat.
Therefore,
W' = QH' - QL'
Note QH' = QL' / (1-η)
W' = QL' / (1-η) - QL'
W'=QL' η / (1-η)
W'= 48000×0.47/(1-0.47)
W'=42566.0377 BTU
1 btu per hour (btu/h) = 0.00039 horsepower (hp)
Then, 42566.0377×0.00039
W'=16.6hp
Which is approximately 17hp
b. Temperature at source
Using ratio of wanted heat to temp
Then,
TH / TL = QH' / QL'
TH = TL ( QH' / QL')
Since, QH' = QL' / (1-η)
Then, TH= TL( QL' /QL' (1-η))
TH=TL/(1-η)
TL=60°F, let convert to rankine
°R=°F+459.67
TL=60+459.67
TL=519.67R
TH=519.67/(1-0.47)
TH=980.51R
Which is approximately 1000R
Answer:
-90.8 Joules
Explanation:
A = Area of container = 50 cm²
d = Length pushed = 15 cm
P = External Pressure = 121 kPa
Change in volume
Work done
Work done by the system is -90.8 Joules
Answer:
True.
Explanation:
Adding a non - volatile solute to solvent, decreases the tendency for water molecules to evaporate into gas phase i.e these non - volatile solute particles obstruct or reduce the rate of evaporation. Few water molecules in the vapour.
Therefore, Adding a nonvolatile solute to a solution decreases the vapor pressure of the solution while
Vapor pressure is a measurement of the likelihood of the molecules of a pure solvent to change from the liquid to the vapor phase.
Using Raoult's Law:
Psol = Xsolv * P°solv
where:
Psol = the vapor pressure of the solvent above the solution,
Xsolv = the mole fraction of the solvent in the solution, and
P°solv = the vapor pressure of the pure solvent.
Answer:
1. According to Newton's first law, when forces are balanced there is no acceleration
2.According to Newton's second law, when forces are unbalanced, there is acceleration
Explanation:
this is because Newton's first law of motion states that every object will continue in its state of rest or uniform motion in a straight line unless a resultant force acts on it
hopes this helps, if not, report it, someone else will do it
Power is the scientific term defined as the rate at which
work is accomplished. Power can be seen everywhere as it is applied to our
everyday living. Power is seen when one pushes a heavy cart. It could be seen
when a baseball hitter hits the ball.
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