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kirza4 [7]
3 years ago
6

The angular speed of digital video discs (DVDs) varies with whether the inner or outer part of the disc is being read. (CDs func

tion in the same way.) Over a 133min playing time, the angular speed varies from 570rpm to 1600rpm .Assuming it to be constant, what is the angular acceleration (in/rads sec ) of such a DVD?
Physics
1 answer:
Kitty [74]3 years ago
8 0

Answer:

α = 0.0135 rad/s²

Explanation:

given,

t = 133 min = 133 x 60 = 7980 s

angular speed varies from 570 rpm to 1600 rpm

now,

570 rpm = 570 \times \dfrac{2\pi}{60}

              = 59.69 rad/s

1600 rpm =  = 570 \times \dfrac{2\pi}{60}

              = 167.6 rad/s

using equation of rotational motion

ωf = ωi + αt    

167.6 = 59.7 + α x 7980

α  x 7980 = 107.9

α = 0.0135 rad/s²

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Which term refers to the ability to think clearly, evaluate information, and reason<br> logically?
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Habits or traits of mind

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3 years ago
Which of the following is an extensive property? Select one: a. Density b. Temperature c. Mass d. Specific Heat e. Pressure
weeeeeb [17]

Answer:

C. Mass

Explanation:

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3 years ago
Magma can partially crystallize at depth and then rise to shallow depths where the remaining magma solidifies. the early-formed
Murljashka [212]
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7 0
4 years ago
A 1000 kg car is rolling slowly across a level surface at 1m/s, heading toward a group of small innocent children.
Ne4ueva [31]

Answer:

The force is -1620.73 N.

Explanation:

Given that,

Mass of car = 1000 kg

Velocity = 1 m/s

Distance = 2 m

Angle = 30°

We need to calculate the force

Using formula of work done

W_{net}=K_{f}-K_{i}

F\times d=K_{f}-K_{i}

Fd\cos\theta=-K_{i}

F=\dfrac{-K_{f}}{d\cos\theta}

F=-\dfrac{\dfrac{1}{2}mv^2}{d\cos\theta}

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F=-1620.73\ N

Hence, The force is -1620.73 N.

7 0
4 years ago
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