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sergiy2304 [10]
3 years ago
7

PLEASE HELP

Physics
1 answer:
CaHeK987 [17]3 years ago
6 0

Answer:

im just 15 yearsold hehhez i dont know that either

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The angular speed of the rotor in a centrifuge increases from 420 to 1420 rad/s in a time of 5.00 s. (a) Obtain the angle throug
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Answer:

a) θ = 2500 radians

b) α = 200 rad/s²

Explanation:

Using equations of motion,

θ = (w - w₀)t/2

θ = angle turned through = ?

w = final angular velocity = 1420 rad/s

w₀ = initial angular velocity = 420

t = time taken = 5s

θ = (1420 - 420) × 5/2 = 2500 rads

Again,

w = w₀ + αt

α = angular accelaration = ?

1420 = 420 + 5α

α = 1000/5 = 200 rad/s²

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3 years ago
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A helicopter blade spins at exactly 110 revolutions per minute. Its tip is 4.50 m from the center of rotation. (a) Calculate th
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Answer:

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(b). The average velocity over one revolution is zero.

Explanation:

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Using formula of average speed

v=r\omega

v = 4.50\times110\times\dfrac{2\pi}{60}

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(b). The average velocity over one revolution is zero because the net displacement is zero in one revolution.

Hence, (a). The average speed is 51.83 m/s.

(b). The average velocity over one revolution is zero.

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Determine if each object is an insulator or a conductor.
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