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natulia [17]
3 years ago
8

An electric fan is running on HIGH. After the LOW button is pressed, the angular speed of the fan decreases to 85.9 rad/s in 2.4

0 s. The magnitude of the angular deceleration is 45.1 rad/s2. Determine the initial angular speed of the fan.
Physics
1 answer:
klemol [59]3 years ago
5 0

Answer: 42.0rad/s to the power of 2

Explanation:

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When the resistance of a circuit is doubled, and no other changes occur, what effect does this have on this current in the circu
liraira [26]

As a result of doubled resistance, current will be halved.

As we know, Ohm's law inversely relates current and resistance to each other. The equation is as follows -

V = I*R, where V is voltage, I is current and R is resistance.

As the question mentions no change in any other parameter, let's assume I₁ and I₂ be initial and final current and R₁ and R₂ initial and final resistance.

So, R₂ will be 2R₁ as it is doubled.

Now, equating the values and finding out the value of final current.

I₁R₁ =  I₂R₂

Keep the value of R₂

I₁R₁ =  I₂2R₁

Cancelling R₁ as it is common on both sides of equation.

So, we get - I₁ =  2I₂

I₂ = I₁/2

Thus, as can be seen above, final current will be half of initial current.

Learn more about Ohm's law and relation between current, voltage and resistance -

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2 years ago
You are watching an archery tournament when you start wondering how fast an arrow is shot from the bow. Remembering your physics
lianna [129]
<h2>Answer:</h2>

<em><u>Velocity of throwing arrow = 43.13 m/s.</u></em>

<h2>Explanation:</h2>

In the question,

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From the <u>equations of the motion</u>,

61 =u.t\\t=\frac{61}{u}

Now,

Also,

Finally, the angle made is 2 degrees with the horizontal.

So,

Final horizontal velocity = v.cos20°

Final vertical velocity = v.sin20°

Now,

u = v.cos20° (No acceleration in horizontal)

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v=u+at\\vsin20=0+9.8(t)\\t=\frac{v.sin20}{9.8}

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We can say that,

\frac{v.sin20}{9.8}=\frac{61}{v.cos20}\\v^{2}.sin20.cos20=597.8\\v^{2}=1860.56\\v=43.13\,m/s

<em><u>Therefore, the velocity with which the arrow was shot by the archer is 43.13 m/s.</u></em>

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3 years ago
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Answer:

Energy is stored in the bonds between atoms

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Which type of interference occurs when two waves exactly cancel out? NEED AN ANSWER ASAP
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