Answer:
define the problem, do background research and specify requirements
Solution :
Given :
k = 0.5 per day


Volume, V 
Now, input rate = output rate + KCV ------------- (1)
Input rate 


The output rate 
= ( 40 + 0.5 ) x C x 1000

Decay rate = KCV
∴
= 1.16 C mg/s
Substituting all values in (1)

C = 4.93 mg/L
Answer:
a.
Here independent variable is negative reinforcement like punishment. The dependent variable is aggressiveness.
Control group : Teacher
Experiment group : Students
b.
Independent variable : Exercise
Dependent variable : Depression
Various levels of independent variables : The time of exercise may be increased or reduced
c.
Independent variable: Environment friendly messages
Dependent variables : Environment friendly behavior
Interaction: The verbal exchange among the peers.
Answer:


Explanation:
given data:
Diameter =





from continuity equation



![v_2 = [\frac{d_1}{d_2}]^2 v_1](https://tex.z-dn.net/?f=v_2%20%3D%20%5B%5Cfrac%7Bd_1%7D%7Bd_2%7D%5D%5E2%20v_1)
![= [\frac{0.200}{0.158}]^2 \times 100](https://tex.z-dn.net/?f=%3D%20%5B%5Cfrac%7B0.200%7D%7B0.158%7D%5D%5E2%20%5Ctimes%20100)

by energy flow equation

and q =0, w =0 for nozzle
therefore we have


but we know dh = Cp dt
hence our equation become




