Mechanical engineers, as well as most other engineers, use thermodynamics extensively in their work. The following polynomial can be used to relate the zero-pressure specific heat of dry air, c p kJ / ( kg K ) , to temperature ( K ) : c p = 0.99403 + 1.671 × 10 − 4 T + 9.7215 × 10 − 8 T 2 − 9.5838 × 10 − 11 T 3 + 1.9520 × 10 − 14 T 4 Determine the temperature that corresponds to a specific heat of 1.2 kJ / ( kg K ) .
Mechanical engineers, as well as most other engineers, use thermodynamics extensively in their work. The following polynomial can be used to relate the zero-pressure specific heat of dry air, c p kJ / ( kg K ) , to temperature ( K ) : c p = 0.99403 + 1.671 × 10 − 4 T + 9.7215 × 10 − 8 T 2 − 9.5838 × 10 − 11 T 3 + 1.9520 × 10 − 14 T 4 Determine the temperature that corresponds to a specific heat of 1.2 kJ / ( kg K ) .
Mechanical engineers, as well as most other engineers, use thermodynamics extensively in their work. The following polynomial can be used to relate the zero-pressure specific heat of dry air,
c
p
kJ
/
(
kg
K
)
, to temperature
(
K
)
:
c
p
=
0.99403
+
1.671
×
10
−
4
T
+
9.7215
×
10
−
8
T
2
−
9.5838
×
10
−
11
T
3
+
1.9520
×
10
−
14
T
4
Determine the temperature that corresponds to a specific heat of
1.2
kJ
/
(
kg
K
)
.
Remix
4. Direction Fields/Phase Portraits. Use the given direction fields to plot solution curves
to each of the given initial value problems.
(a)
x = x+2y
1111
y = -3x+y
with x(0) = 1, y(0) = -1
(b) Consider the initial value problem corresponding to the given phase portrait.
x = y
y' = 3x + 2y
Draw two "straight line solutions"
passing through (0,0)
(c) Make guesses for the equations of the straight line solutions: y = ax.
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