Answer:
c. allows planners to work out any problems before the program is launched
Explanation:
Pilot testing is simply aimed at getting it right before the launch of a program, it is also called pilot run, pilot project, feasibility run, etc. Pilot testing is the rehearsal or practice done for an idea, program, research study or invention with few participants prior to lunching out the main program. The main purpose of pilot testing is to determine how feasible a project is, it can also help to evaluate the cost of an idea, invention, research study, etc.
Answer:
N_A=1.5*10^-8 kmol/s.m^2
Explanation:
<u>KNOWN: </u>
Molar concentration of helium at the inner and outer surfaces of a plastic membrane. Diffusion coefficient and membrane thickness.
<u>FIND:</u>
Molar diffusion flux.
<u>ASSUMPTIONS:</u>
(1) Steady-state conditions, (2) One-dimensional diffusion in a plane wall, (3) Stationary medium, (4) Uniform C = C_A + C_B.
<u>ANALYSIS:</u> The molar flux may be obtained from
N_A=D_AB/L(C_A,1-C_A,2)
=10^-9 m^2/s/0.001 m(0.02-0.005)kmol/m^3
N_A=1.5*10^-8 kmol/s.m^2
<u>COMMENTS:</u> The mass flux is:
n_A,x=M_a*N_A,x
n_A,x=6*10^-8 kg/s m^2
Answer:
A moving player may only take 2 legal steps after catching the ball to shoot, pass or to come to a stop.
so (B. 2)
Explanation:
On this play, the offensive player catches the ball in the air and lands with a left, right, left prior to shooting. This is a traveling violation for taking 3 steps.
Answer:
As the temperature of a thermal radiator is increased
Group of answer choices
- the object appears redder.
- the object appears bluer.
- the object emits more power for the same area.
- the object emits less power for the same area.
- the object expands to keep the same power per units area.
<em>When the temperature of a thermal radiator increases ;</em>
- <em>the object emits more power for the same are</em>
- <em>the object becomes bluer</em>
Explanation:
Thermal radiation involves the transfer of heat between molecules of two substances without direct contact with each other. When a body is heated to a given temperature it begins to emit light which is transferred to nearby objects as thermal radiation. The medium through which the heat is transferred could be liquid, solid, or in a vacuum.
<h3>How temperature affects thermal radiation.</h3>
Temperature determines the amount of heat that is been radiated from a body. An increase in temperature would increase the thermal radiation of the body. The increase in the heat radiation results to increase in the thermal energy of the body. Also when a body is heated it tends to be bluer than a cool object, this is caused by the rapid movement of the molecules.
Therefore When the temperature of a thermal radiator increases ;
- the object emits more power for the same are
- the object becomes bluer
Answer:
Explanation:
Given that:
The height of a triangular stabilizing fin on its stern is 1 ft tall
and it length is 2 ft long.
Temperature = 60 °F
The objective is to determine the drag on the fin when the submarine is traveling at a speed of 2.5 ft/s.
From these information given; we can have a diagrammatic representation describing how the triangular stabilizing fin looks like as we resolve them into horizontal and vertical component.
The diagram can be found in the attached file below.
If we recall ,we know that;
Kinematic viscosity v = 
the density of water ρ = 62.36 lb /ft³
which is less than < 5.0 × 10⁵
Now; For laminar flow; the drag on the fin when the submarine is traveling at 2.5 ft/s can be determined by using the expression:
where;
= strip area
Therefore;
Let note that y = 0.5x from what we have in the diagram,
so , x = y/0.5
By applying the rule of integration on both sides, we have:
Let U = (2-2y)
-2dy = du
dy = -du/2
![F_D = -0.568 [ \dfrac{\frac{1}{2}U^{ \frac{1}{2}+1 } }{\frac{1}{2}+1}]^0__2](https://tex.z-dn.net/?f=F_D%20%3D%20-0.568%20%5B%20%5Cdfrac%7B%5Cfrac%7B1%7D%7B2%7DU%5E%7B%20%5Cfrac%7B1%7D%7B2%7D%2B1%20%7D%20%20%7D%7B%5Cfrac%7B1%7D%7B2%7D%2B1%7D%5D%5E0__2)
![F_D = -0.568 [ \dfrac{2}{3}U^{\frac{3}{2} } ] ^0__2](https://tex.z-dn.net/?f=F_D%20%3D%20-0.568%20%5B%20%5Cdfrac%7B2%7D%7B3%7DU%5E%7B%5Cfrac%7B3%7D%7B2%7D%20%7D%20%20%20%5D%20%5E0__2)
![F_D = -0.568 [0 - \dfrac{2}{3}(2)^{\frac{3}{2} } ]](https://tex.z-dn.net/?f=F_D%20%3D%20-0.568%20%5B0%20-%20%20%5Cdfrac%7B2%7D%7B3%7D%282%29%5E%7B%5Cfrac%7B3%7D%7B2%7D%20%7D%20%20%20%5D)
![F_D = -0.568 [- \dfrac{2}{3} (2.828427125)} ]](https://tex.z-dn.net/?f=F_D%20%3D%20-0.568%20%5B-%20%5Cdfrac%7B2%7D%7B3%7D%20%282.828427125%29%7D%20%20%20%5D)
