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3 years ago

I'm not sure what to use help me please

Physics

1 answer:

DaniilM [7]3 years ago

5 0

Answer:

Mass of the ring is 2.5 kg.

Given:

Moment of inertia of a ring = 0.4 kg. $m^{2}$

Radius = 40 cm = 0.4 m

To find:

Mass of the ring = ?

Formula used:

I = m $r^{2}$

Where I = moment of inertia

r = radius of the ring

m = mass of the ring

Solution:

Moment of inertia of a ring is given by,

I = m $r^{2}$

Where I = moment of inertia

r = radius of the ring

m = mass of the ring

0.4 = m ×0.4×0.4

m = 0.4/(0.4×0.4)

m = 1/0.4

m = 2.5 kg

Mass of the ring is 2.5 kg.

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4 years ago

A girl of mass 50.6 kg stands on the edge of a frictionless merry-go-round of mass 827 kg and radius 3.72 m that is not moving.

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Answer:

(a). The value of angular speed of the merry-go-round $\omega$ = - 5.82 × $10^{-3}$ $\frac{rad}{s}$

(b). The linear speed of the girl after the rock is thrown V = -1.89 × $10^{-2}$ $\frac{m}{s}$

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Given data

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Radius r = 3.72 m

The speed of the rock relative to the ground $V_{r}$ = 7.82 $\frac{m}{s}$

(a). The angular speed of the merry-go-round is given by

$\omega = - [\frac{m_{r}v_{r} }{r} ] \frac{2}{m_{m} + 2m_{g} }$

Put all the values in above formula

$\omega = \frac{(1.13)(7.82)}{3.27} \frac{2}{827 + (2)50.6}$

$\omega$ = - 5.82 × $10^{-3}$ $\frac{rad}{s}$

This is the value of angular speed of the merry-go-round.

(b). The liner speed of the girl is given by

⇒ V = r × $\omega$

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7 0

3 years ago

A reactor operating at 1 MW is scrammed by instantaneous insertion of $5.00 of negative reactivity. Approximately how long does

Novosadov [1.4K]

Answer:

time is 3333.33 min or 55.55 hr

Explanation:

given data

reactor operating = 1 MW

negative reactivity = $5

power = 1 miliwatt

to find out

how long does it take

solution

we know here power coefficient that is

power coefficient = $\frac{10^{6} }{10^{6} }$

power coefficient = 1

so time required to reach power is

power = reactivity × time / power coefficient + reactor operating

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5t = $10^{6}$ - $10^{-3}$

t = 199999.99 sec

so time is 3333.33 min or 55.55 hr

4 0

4 years ago