Physics, 09.12.2019 02:31 yedida

Facts about electricity and magnetism:

stuff id need to know for an exam

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You're in luck ! This is gonna be easy. Listen to this:

On the exam, they're gonna put questions about all that same stuff
that they talked about IN the class all those times ! The exact same
material. And if they didn't talk about it in class, then it won't be on
the exam ! How cool is that ? !

All that stuff you copied from the board, all those notes you wrote in
your notebook so you'd remember it, all those handouts they gave out
in class, all that homework you did ... THAT's what they'll put on the exam !

It's gonna be all stuff that you seen and heard and studied before.
No surprises. It'll be a breeze, and you're totally gonna do fine.

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.

Answer from: Quest

The independent variable would be the fertilizer as it is what the dependent variable (the growth of grass) depends on.

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