3 years ago

Select the correct answer.

Physics

1 answer:

kkurt [141]3 years ago

5 0

O.C is the correct answer but I’m not sure guys

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3 years ago

The _________ of a line is defined as its rise divided by its run.

Alexeev081 [22]

Answer:

This is the definition of slope.

Step-by-step explanation:

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A centrifuge rotor has a moment of inertia of 3.25*10-2 kg*m2. how much energy is required to bring it from rest to 8750 rpm

masya89 [10]

The rotational kinetic energy of a rotating object is
$K= \frac{1}{2}I \omega^2$
where
I is the moment of inertia of the body
$\omega$ is its angular speed

Let's convert the angular speed from rpm (revolutons per minutes) into rad/s. Keeping in mind that
$1 rev = 2 \pi rad$
$1 min = 60 s$
we have
$\omega=8750 \frac{rev}{min} \cdot \frac{2 \pi rad/rev}{60 s/min}=915.8 rad/s$

So the final kinetic rotational energy of the rotor is
$K= \frac{1}{2} I \omega^2 = \frac{1}{2}(3.25 \cdot 10^{-2} kg m^2)(915.8 rad/s)^2=1.36 \cdot 10^4 J$

And since its initial energy is zero (it starts from rest), this is equal to the amount of energy needed to bring it at speed 8750 rpm.

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4 years ago