4 years ago

What does critical mass depend on

2 answers:

8 0

Answer:

The critical mass depends upon its nuclear properties, its density, it shape, its enrichment, its purity, its temperature and its surroundings

Explanation:

Law Incorporation [45]4 years ago

6 0

The critical mass depends upon its nuclear properties

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A flywheel flows from 250rpm to 150rpm in 4.2 seconds. How many revolutions occur during this time

Assoli18 [71]

Answer:

7revolutions

Explanation:

Given parameters:

Initial revolution = 250rpm

Final revolution = 150rpm

Time = 4.2s

Unknown:

Number of revolutions that occur at this time = ?

Solution:

To solve this problem;

let us find the change in revolution = 250rpm - 150rpm = 100rpm

Convert the time to seconds;

60s makes 1 minute

4.2s will make $\frac{4.2}{60}$ = 0.07min

So;

The number of revolutions at this time = 100rpm x 0.07min

= 7revolutions

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4 years ago

A 3-kg wheel with a radius of 35 cm is spinning in the horizontal plane about a vertical axis through its center at 800 rev/s. A

Kruka [31]

Answer:

$\omega_f = 585.37 \ rev/s$

Explanation:

given,

mass of wheel(M) = 3 Kg

radius(r) = 35 cm

revolution (ω_i)= 800 rev/s

mass (m)= 1.1 Kg

I_{wheel} = Mr²

when mass attached at the edge

I' = Mr² + mr²

using conservation of angular momentum

$I \omega_i = I' \omega_f$

$(Mr^2) \times 800 = ( M r^2 + m r^2) \omega_f$

$M\times 800 = ( M + m )\omega_f$

$3\times 800 = (3+1.1)\times \omega_f$

$2400 = (4.1)\times \omega_f$

$\omega_f = 585.37 \ rev/s$

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Gravity causes___ objects to accelerate

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Gravity causes falling objects to accelerate.

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To be careful towards what you do.

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PLEASE HELP ME WITH THIS

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Explanation:

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3 years ago