A girl delivering newspapers covers her route by traveling 5.00 blocks west, 5.00 blocks north, and then 7.00 blocks east. What
1 answer:
You might be interested in
Answer:
a. 7.046 Nm²/C
b. 2.348 Nm²/C
Explanation:
Data given:
Base of equilateral triangle = 25.0 cm = 0.25 m
Strength of electric field = 260 N/C
In order to find the electric flux we first have to find out the area of triangle.
Area of triangle =
=
= 0.0271 m³
Lets find electric flux,
Electric Flux = E. A
= 260×0.0271
= 7.046 Nm²/C
Now we can find the electric flux through each of the three sides.
Electric flux through three sides =
= 2.348 N m²/C
Answer:
(a) W/m = 49.334 Btu/lb
(b) = 22.12 Btu/lb
Explanation:
For the given problem, it can be assumed that the system is operating at steady state and the effects of potential energy can be neglected.
(a) Using the thermodynamic table for air.
At the temperature ()of 800 ºR and pressure (
) of 75 Ibf/in.^2, we can deduce that:
Specific enthalpy () = 191.81 BTu/lb
Specific entropy () = 0.6956 Btu/(lb.ºR)
At the temperature ()of 600 ºR and pressure (
) of 15 Ibf/in.^2, we can deduce that:
Specific enthalpy () = 143.47 BTu/lb
Specific entropy () = 0.6261 Btu/(lb.ºR)
The work done can be calculated using energy rate equation:
Q/m = heat transfer = -2 Btu/lb
= 400 ft/s
= 100 ft/s
[/tex] = -2 + 48.34 + 29.938 = 49.334 Btu/lb
(b) To calculate the exergy destruction, we will use the equation for exergy rate:
The equation above is further simplified to:
Using a reference temperature (To) = 500 °R
Average surface temperature (Tb = 620°R
= 500*[-0.0695 +0.068688*1.609 +0.003225] = 22.12 Btu/lb