Physics, 27.09.2019 16:30 Sruyle51230

Which evidence did ottowa scientists collect in researching pcb concentrations in alaska?

a) pcbs were found in smaller concentrations in lakes where more salmon spawned.
b) pcbs were found in the same concentrations in lakes at similar altitudes.
c) pcbs were found in greater concentrations in lakes where more salmon spawned.
d) no pcbs were found in the lakes that were farthest from electronics industry dumping grounds.

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Answer from: s237200

PCBs were found in greater concentrations in lakes where more salmon spawned.

Answer from: Fireburntbudder

Hey mate!
You stuck?

The answer is C) PCBs were found in greater concentrations in lakes where more salmon spawned. Evidence of hti swas depicted in the Ottowa notes of travel.

Hope this helps! :)

Answer from: Quest

answer: a. same unit

explanation:

Answer from: Quest

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

$f\alpha \frac{dp}{dt}$

⇒ $f= k \frac{dp}{dt}$

here k is the proportionality constant whose value is 1.

$f=\frac{dp}{dt}$

$f= \frac{d[mv]}{dt}$

$f= m\frac{dv}{dt} +v\frac{dm}{dt}$

$f=ma+v\frac{dm}{dt}$ [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.

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Which evidence did ottowa scientists collect in researching pcb concentrations in alaska?

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