Answer:
Signal the driver behind you when it is safe to pass by turning on your four-way emergency flashers.
Avoiding casualties is the top priority when driving, the other choices given do not put whether there are cars in the other lane into consideration, therefore making them incorrect. Signaling the driver when it is safe gives you the time and them the gateway to pass, making a nice interaction keep you both alive.
Given:
size of scale model = 4(size of pump)
power ratio of pump and scale model = 5:1
Solution:
Let the diameter of scale model and pump be 
and 
respectively
and head be 
and 
respectively
Now, power, P is given as a function of head(H) and dischagre(Q)
P = 
(1)
From eqn (1):
and
So,
Therefore,
= 
=
= 
= 
= 
A system is a linear system if all equations inside the system can be simplified into the form,
aka linear form of a linear equation.
So to sum up, a system is linear if all equations are linear equations.
Hope this helps :)
Answer:
They include PCBs, dioxins, furans, hexachlorobenzene, benzo(a)pyrene (one of many polyaromatic hydrocarbons or PAHs), lead and mercury compounds and pesticides (toxaphene, mirex, aldrin/dieldrin, DDT). 3 Great Lakes Water Quality Agreement Work Group Report on Chemicals of Emerging Concern, August 2009.
