Answer and Explanation: A fluid flow is <u>steady</u> when its properties (velocity, pressure and others) <u>do</u> <u>not</u> change over time: P = P(x,y,z), with P being any of the properties.
So, an unsteady flow does depend upon time: P = P(x,y,z,t).
1. V = []i : This velocity field is one-dimension, because there is only the component in the x-direction and unsteady, because it is dependent upon the variable time (t);
2. V = : is a three-dimensional field, because there is one component for each direction (x, y and z) and is steady, since it's independent of time;
3. V = axyi - bytj : is a 2-dimensional field, and since it changes with time, it is unsteady;
4. V = axi - byj + ctk : is a 3-dimensional field and the flow is unsteady;
Answer:
Explanation:
Given data:
T_1 = 55 degree F
t_2 - 25 degree F
COP = 2.45
Production rate = 28 lbm/h
we knwo that cooling load is given
Power is determined as
Answer:
When you come to an intersection, follow this important rule (left, right, left). Look to the left first because vehicles coming from the left are closer to you. Look to the right. Take one more look to the left before you pull out.
Explanation:
Answer:
Only use none conductive tools and materials
Answer:
B. 152.64
Explanation:
The average value of a sinusoidal waveform taken over half cycle is given by
or simplifying it further results in;
We are given
Hence option B is the right answer
Please note:
The average value of a pure sinusoidal wave over a full cycle (0 to 360°) is always zero since the positive and negative half cancel out each other due to being symmetric.
This is why we always take average over half cycle (0 to 180°).