2 years ago

If the refractive index of water is 1.33, then its critical angle is...

Physics

1 answer:

natulia [17]2 years ago

7 0

I c
=48 ∘45 1
. Fkfkkvkv

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A 49.0 kg wheel, essentially a thin hoop with radius 0.730 m, is rotating at 114 rev/min. It must be brought to a stop in 22.0 s

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Mass of the wheel, m = 49 kg

Radius of the hoop, r = 0.73 m

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Final angular speed of the wheel, $\omega_f=0$

Time, t = 22 s

(a) If I is the moment of inertia of the hoop. It is equal to,

$I=mr^2$

$I=49\times (0.73)^2$

$I=26.11\ kg-m^2$

We know that the work done is equal to change in kinetic energy.

$W=\Delta E$

$W=\dfrac{1}{2}I(\omega_f^2-\omega_i^2)$

$W=-\dfrac{1}{2}\times 26.11\times (11.93^2)$

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