Physics, 27.07.2019 15:30 neyssa83

An air capacitor is made from two flat parallel plates 1.50 mm apart. the magnitude of charge on each plate is 0.0180 μc when the potential difference is 200 v. when the charge is 0.0180 μc, what total energy is stored?

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The energy stored in a capacitor is given by
$U= \frac{1}{2} CV^2$
where V is the voltage applied, and $C= \frac{Q}{V}$ is the capacitance.

Substituting C=Q/V

into the first equation, we can rewrite the energy stored as
$U= \frac{1}{2} QV$
And since we know the charge, $Q=0.0180 \mu C=0.0180 \cdot 10^{-6} C$ and the voltage difference, V=200 V, we find the energy stored:
$U= \frac{1}{2}(0.0180 \cdot 10^{-6} C)(200 V)=1.8\cdot 10^{-6} J$

Answer from: Quest

32: from largest to smallest, this hierarchy includes eons, eras, periods, epochs, and ages.

33: answer is c

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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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