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3 years ago

9

a capacitor of unknown charged capacitance c is charged to 100v and the connected across an intially uncharged 60micro f capacit

or .if the final potenial diffrence across the 60micro-f capacitor is 40v ,determine c

1 answer:

poizon [28]3 years ago

6 0

Answer:

hi thank you for your free point

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A disk shaped grindstone of mass 3.0 kg and radius 8 cm is spinning at 600 rpm. After the power is shut off the frictional torqu

seropon [69]

Answer:

$\theta=50\ revolution$

Explanation:

It is given that,

Mass of the grindstone, m = 3 kg

Radius of the grindstone, r = 8 cm = 0.08 m

Initial speed of the grindstone, $\omega_i=600\ rpm=62.83\ rad/s$

Finally it shuts off, $\omega_f=0$

Time taken, t = 10 s

Let $\alpha$ is the angular acceleration of the grindstone. Using the formula of rotational kinematics as :

$\alpha =\dfrac{\omega_f-\omega_i}{t}$

$\alpha =\dfrac{0-62.83}{10}$

$\alpha =-6.283\ rad/s^2$

Let $\theta$ is the number of revolutions of the grindstone after the power is shut off. Now using the third equation of rotational kinematics as :

$\omega_f^2-\omega_i^2=2\alpha \theta$

$\theta=\dfrac{\omega_f^2-\omega_i^2}{2\alpha }$

$\theta=\dfrac{-62.83^2}{2\times -6.283}$

$\theta=314.15\ radian$

$\theta=49.99\ revolution$

or

$\theta=50\ revolution$

So, the number of revolutions of the grindstone after the power is shut off is 50.

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Rock composed of many thin layers. This image appears in an Earth science magazine with this caption: "A non-foliated rock found

blondinia [14]

Answer:

its B

Explanation:

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A car driving at a constant speed of 64 mi/h travels 68 miles. How many hours did this take?

babymother [125]

64 miles/hour
Therefore 1/64 hours/mile
68 miles * 1/64 hours/mile (notice how miles cancels out)
Therefore the answer is 68/64 hours = 1.0625 hours = 1 hour 3min and 45sec.

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Art [367]

That's false. Mechanical waves (like sound and ocean waves) do
need a medium to travel in, but electromagnetic waves (like radio
and light) don't.

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A solution with a pH of seven must be <br> A. An acid <br> B. A base<br> C.neutral<br> D.water

Dmitry [639]

A pH scale goes from 0 - 14.
7 is in the middle so it is neutral

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3 years ago