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3 years ago

Part A

Physics

1 answer:

statuscvo [17]3 years ago

6 0

The relation between intensity and distance is given by:

I=Pd2
I
=
P
d
2
I=
d
2

P

Therefore we can write an equation

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A brave child decides to grab onto an already spinning merry‑go‑round. The child is initially at rest and has a mass of 34.5 kg.

rodikova [14]

Answer:

the moment of inertia of the merry go round is 38.04 kg.m²

Explanation:

We are given;

Initial angular velocity; ω_1 = 37 rpm

Final angular velocity; ω_2 = 19 rpm

mass of child; m = 15.5 kg

distance from the centre; r = 1.55 m

Now, let the moment of inertia of the merry go round be I.

Using the principle of conservation of angular momentum, we have;

I_1 = I_2

Thus,

Iω_1 = I'ω_2

where I' is the moment of inertia of the merry go round and child which is given as I' = mr²

Thus,

I x 37 = ( I + mr²)19

37I = ( I + (15.5 x 1.55²))19

37I = 19I + 684.7125

37I - 19 I = 684.7125

18I = 684.7125

I = 684.7125/18

I = 38.04 kg.m²

Thus, the moment of inertia of the merry go round is 38.04 kg.m²

7 0

4 years ago

Read 2 more answers

The National Aeronautics and Space Administration (NASA) studies the physiological effects of large accelerations on astronauts.

m_a_m_a [10]

Answer:

$v = 23.95 m/s$

Explanation:

As we know that when astronaut is revolving in circular path then the acceleration of the astronaut is due to centripetal acceleration

so it is given as

$a_c = \frac{v^2}{R}$

here we know that

$a_c = 4.50 g$

also we know that

$R = 13 m$

now we have

$4.50 \times 9.81 = \frac{v^2}{13}$

$v = 23.95 m/s$

3 0

4 years ago

Which statement BEST explains the relationship between mass and weight.A.mass increases, weight is decreases.B.mass increases, w

Dmitry_Shevchenko [17]

Weight is caused by the influence of gravity on matter/mass. Weight is given by the formulae;

Weight = Mass * Gravitational acceleration

On earth, the gravitation acceleration is a constant 10m/s2

Therefore the weight will be influenced by mass of the object in a direct relationship.

An increase in mass will cause a proportionate increase in weight.

Explanation:

Gravity is not constant across the universe with larger celestial bodies have a greater gravitational pull. Therefore an object with the same mass on earth may weigh differently on another celestial body with different gravitational acceleration. An example is the Moon. Due to the fact that the Moon has approximately ¹/3 of earth’s gravitational force, astronauts weight ¹/3 times less on the moon than on earth.

Learn More:

For more on weight and mass check out;

brainly.com/question/1265220

brainly.com/question/1377794

brainly.com/question/3272477

brainly.com/question/5310868

brainly.com/question/11248471

brainly.com/question/1658757

#LearnWithBrainly

6 0

4 years ago

A fire engine must lift 30 kg of water a vertical distance of 20 m each second. What is the amount of power needed for the water

ivolga24 [154]

Power<span> is the rate of doing work. It is the amount of energy consumed per unit time. Having no direction, it is a scalar quantity. We express it as follows:

P = W / t
where W = Fd
F = mg

Therefore,

P = mgd / t
P = (30)(9.81)(20) / 1 = 5886 W</span>

3 0

3 years ago

The brightness of a star as seen from Earth is referred to as brightness.

jolli1 [7]

Technically it is referred to as <em>star brightness</em> but yes you have the general idea.

4 0

4 years ago

Read 2 more answers