Explanation:
Expression for energy balance is as follows.
or, 
Therefore,
Hence, expression for exit velocity will be as follows.
= ![V^{2}_{1} + 2C_{p}(T_{1} - T_{2})]^{0.5}](https://tex.z-dn.net/?f=V%5E%7B2%7D_%7B1%7D%20%2B%202C_%7Bp%7D%28T_%7B1%7D%20-%20T_%7B2%7D%29%5D%5E%7B0.5%7D)
As 
for the given conditions is 1.007 kJ/kg K. Now, putting the given values into the above formula as follows.
![V_{2} = V^{2}_{1} + 2C_{p}(T_{1} - T_{2})]^{0.5}](https://tex.z-dn.net/?f=V_%7B2%7D%20%3D%20V%5E%7B2%7D_%7B1%7D%20%2B%202C_%7Bp%7D%28T_%7B1%7D%20-%20T_%7B2%7D%29%5D%5E%7B0.5%7D)
= ![[(350 m/s)^{2} + 2(1.007 kJ/kg K) (30 - 90) K \frac{1000 m^{2}/s^{2}}{1 kJ/kg}]^{0.5}](https://tex.z-dn.net/?f=%5B%28350%20m%2Fs%29%5E%7B2%7D%20%2B%202%281.007%20kJ%2Fkg%20K%29%20%2830%20-%2090%29%20K%20%5Cfrac%7B1000%20m%5E%7B2%7D%2Fs%5E%7B2%7D%7D%7B1%20kJ%2Fkg%7D%5D%5E%7B0.5%7D)
= 40.7 m/s
Thus, we can conclude that velocity at the exit of a diffuser under given conditions is 40.7 m/s.
No becuase the simplified case of constant speed, use the formula:
<span>distance = speed x time</span>
Answer:
A block of mass M = 5 kg is resting on a rough horizontal surface for which the coefficient of friction is 0.2. When a force F = 40N is applied, the acceleration of the block will be then (g=10ms
2 ).
Mass of the block=5kg
Coeffecient of friction=0.2
external applied force, F=40N
The angle at which the force is applied=30degree
So the horizontal component of force=Fcos30=40×
23 =20 3 N
While the uertical component of the force acting in upward direction=Fsin30=40× 21
=20N
The normal reaction from the surface (N)=mg−Fsin30=50−20=30N
So the ualue of limiting friction=μN=0.2×30=6N
Hence the net horizontal force on the block=Fcos30=μN=20
3
N−6N=28.64N
The horizontal acceleration of the block=
m
Fcos30−μN = 528.64
=5.73m/s 2
Answer:
baking the cake batter
Explanation:
Baking the cake batter will indicate that chemical change has occurred here. What is a chemical change?
- A chemical change is one in which a new kind of matter is formed.
- It is usually accompanied by energy either evolution or absorption of energy in form of heat or light or both.
- The process is irreversible.
- When the batter bakes, a new substance different from the cake mix is obtainable.
- We cannot get back the ingredient from this baked cake. It is impossible.
- This is good indicator of chemical change.
