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4 years ago

9

What are the three reasons cells divide?

1 answer:

hoa [83]4 years ago

7 0

1 growth. Go from one cell/( zygote to a trillion)
2 replace. Repair\ 50 million cells die second.
3 reproduction. ( make cells for reproduction make specialized sex cells)

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A 2.66 kg, 22.25 cm diameter turntable rotates at 238 rpm on frictionless bearings. Two 420 g blocks fall from above, hit the tu

Phantasy [73]

Answer:

The value is $w_f = 146 \ rpm$

Explanation:

From the question we are told that

The mass is $m = 2.66 \ kg$

The diameter is $d = 22.25 \ cm = 0.2225 \ m$

The angular speed is $w_i = 238 \ rpm$

The mass of each of the blocks is $m_b = 420 \ g = 0.420 \ kg$

Generally the radius of the turntable is mathematically represented as

$r = \frac{d}{2}$

=> $r = \frac{0.2225}{2}$

=> $r = 0.11125$

The moment of inertia of the turntable before the blocks fell is mathematically represented as

$I_{i} = \frac{1}{2} * m * r^2$

=> $I_{i} = \frac{1}{2} * 2.66 * (0.11125)^2$

=> $I_{i} = 0.01646 \ kg\cdot m^2$

The moment of inertia of the turntable after the blocks fell is mathematically represented as

$I_{f} = \frac{1}{2} * m * r^2 + 2 m_b * r^2$

=> $I_{f} = \frac{1}{2} * 2.66 * (0.11125)^2 + 2 * 0.420 * 0.11125^2$

=> $I_{f} = 0.02686 \ kg\cdot m^2$

Generally from the law of angular momentum conservation

$L_i = L_f$

Here $L_i$ is the initial angular momentum of the turntable before the blocks fell which is mathematically represented as

$L_i = I_i * w_i$

and $L_f$ is the initial angular momentum of the turntable after the blocks fell which is mathematically represented as

$L_i = I_f * w_f$

So

$0.01646* 238 = 0.02686 * w_f$

=> $w_f = 146 \ rpm$

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3 years ago