Answer:
The BOD5 for this sample is 5 mg/L
Explanation:
The BOD5 takes into consideration the difference between the initial DO and the final DO divided by the fraction of the sample tested in a 300 mL BOD flask. The problem states that the sample was directly placed in a BOD bottle so we assume that the volume used was 300 mL of the water sample. The fraction of water is 1 (300/300).
BOD5 = (10-5)/1
BOD 5 = 5 mg/L
Well, it depends on where you are, for example, f your in ecaudor the temp there is varying becuase of that is the equator it affect how the weather is.
Explanation:
At the center its weight is zero. Or you can argue by symmetry: if the weight is not zero, in what direction would it act?
.................... thats Hard...!!!?
The answer would be y axis, x axis, another y axis and x axis. One then can reflect y axis (5,1) and would reflect to x axis (5,-1) And then across y axis (-5,1) and would back to (-5,1). Hope this is the answer and would help.
