Efficiency η of a Carnot engine is defined to be:
<span>η = 1 - Tc / Th = (Th - Tc) / Th </span>
<span>where </span>
<span>Tc is the absolute temperature of the cold reservoir, and </span>
<span>Th is the absolute temperature of the hot reservoir. </span>
<span>In this case, given is η=22% and Th - Tc = 75K </span>
<span>Notice that although temperature difference is given in °C it has same numerical value in Kelvins because magnitude of the degree Celsius is exactly equal to that of the Kelvin (the difference between two scales is only in their starting points). </span>
<span>Th = (Th - Tc) / η </span>
<span>Th = 75 / 0.22 = 341 K (rounded to closest number) </span>
<span>Tc = Th - 75 = 266 K </span>
<span>Lower temperature is Tc = 266 K </span>
<span>Higher temperature is Th = 341 K</span>
Answer:
15.8 seconds
Explanation:
Create an extended calculation to convert all the unit to what you need.
160 km 1000 m 1 hour 1 min
----------- x ------------- x -------------- x ---------- = 44.4 m/s
1 hour 1 km 60 min 60 sec
So 160km/hr is equal to 44.4m/s
Now you can figure out how many seconds it will take to go 700 meters.
44.4 m
---------- X x sec = 700 m
1 sec
Solve for x sec
x sec = 700m / 44.4 m/s
= 15.8 seconds
Answer:
Columns of the periodic table are called groups.
Answer:
Explanation:
a ) density = mass / volume
density of mars / density of earth
= (mass of mars/mass of earth) x (volume of earth / volume of mars)
= (mass of mars/mass of earth) x (diameters of earth / diameters of mars)³
= 0.11 x (130/69)³
= .73
b )
gravitational acceleration (g) = GM/R²
Gravitational acceleration on mars / Gravitational acceleration on earth
= (mass of mars / mass of earth) x (radius of earth / radius of mars )²
= .11 x (130/69 )²
= .39
Gravitational acceleration on mars = .39 x Gravitational acceleration on earth
Gravitational acceleration on mars = 9.8 x .39
= 3.82 m/s
c ) Escape velocity
c ) escape speed of mars / escape velocity of earth
= [( g on mars / g on earth ) x ( radius of mars / radius of earth )]°⁵
= √(.39 x 69/130)
= .4549
escape speed of mars = .4549 x escape velocity of earth
= .4549 x 11.2km/s
= 5.1 km / s