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Marianna [84]
3 years ago
6

A 4.50-kg wheel that is 34.5 cm in diameter rotates through an angle of 13.8 rad as it slows down uniformly from 22.0 rad/s to 1

3.5 rad/s. What is the magnitude of the angular acceleration of the wheel?
Physics
2 answers:
Mila [183]3 years ago
6 0

Answer:

-10.9 rad/s²

Explanation:

ω² = ω₀² + 2α(θ - θ₀)

Given:

ω = 13.5 rad/s

ω₀ = 22.0 rad/s

θ - θ₀ = 13.8 rad

(13.5)² = (22.0)² + 2α (13.8)

α = -10.9 rad/s²

vfiekz [6]3 years ago
4 0

Use the formula

{\omega_f}^2-{\omega_i}^2=2\alpha\Delta\theta

\implies\left(13.5\dfrac{\rm rad}{\rm s}\right)^2-\left(22.0\dfrac{\rm rad}{\rm s}\right)^2=2\alpha(13.8\,\mathrm{rad})

\implies\alpha=-10.9\dfrac{\rm rad}{\mathrm s^2}

so the magnitude is 10.9 rad/s^2.

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a ball is thrown striaght up in the air and then falls back to earth. if the downward fall takes 2.2s, how fast is the ball trav
lapo4ka [179]

The velocity of the ball when it strikes the ground, given the data is 21.56 m/s

<h3>Data obtained from the question</h3>

From the question given above, the following data were obtained:

  • Time to reach ground from maximum height (t) = 2.2 s
  • Initial velocity (u) = 0 m/s
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<h3>How to determine the velocity when the ball strikes the ground</h3>

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v = u + gt

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Question 2 of 10
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A charge +Q is located at the origin and a second charge, +4Q, is at distance (d) on the x-axis.
tatiyna

Answer:

a)   x = ⅔ d , b) the charge must be negative, c) Q

Explanation:

a) In this exercise the force is electric between the charges, we are asked that the system of the three charges is in equilibrium, we use Newton's second law. Balance is on the third load that we are placing

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        -F₁₂ + F₂₃ = 0

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let's replace the values

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suppose charge 3 is placed at point x

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we substitute

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