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3 years ago

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A disc initially at rest experiences an angular acceleration of 3.11 rad/s for a time of 15.0 s. What will the angular speed of

the disc be at this time, in units of rad/s?

1 answer:

kolezko [41]3 years ago

6 0

Answer:

The angular speed of the disc be at this time is 46.65 rad/s.

Explanation:

Given that,

Angular acceleration $\alpha= 3.11\ rad/s^2$

Time t =15.0 s

We will calculate the angular speed of the disc

A disc initially at rest.

So, $\omega=0$

Using rotational kinematics equation

$\omega'=\omega+\alpha\ t$

Where, $\omega$ = initial angular speed

$\omega'$ =final angular speed

$\alpha$ = angular acceleration

Put the value in the equation

$\omega'=0+3.11\times15$

$\omega'=46.65\ rad/s$

Hence, The angular speed of the disc be at this time is 46.65 rad/s.

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On an aircraft carrier, a jet can be catapulted from 0 to 240 km/h in 2.10 s. If the average force exerted by the catapult is 9.

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<h2>Answer</h2>

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<h2>Explanation</h2>

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$Force = Mass * Acceleration$

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The mass of jet = ?

First detrmine the acceleration as

{/tex}Acceleration = Velocity/Time {/tex}

$Acceleration = 66.6 ms^{-1}/2.1 s$

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4 years ago

Glycerin at 30°C has a density of 1,260 kg/m3 and a viscosity of 0.630 Pa s. In a laboratory experiment, some glycerin is forced

Alekssandra [29.7K]

Answer:

Explanation:

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η is viscosity of liquid flowing = .63

l is length of tube = .10 m

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3 years ago

A cheetah is resting when a hare traveling in a straight path passes at it's top speed of 25m/s. It takes the cheetah 1.5 second

timofeeve [1]

Answer:

a) 2.3 m/s^2

b) 33.3 s

c) 803 m

d) 0 m/s

Explanation:

We need to apply the accelerated motion formulas.

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$a=\frac{v_f-v_o}{t}\\\\a=\frac{45m/s-0m/s}{20s}\\\\a=2.3m/s^2$

we need to calculate the time the cheetah takes to stop when it starts to decelerate:

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We need to calculate the displacement for all of the stages:

stage 1:

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The total displacement is given by:

$d=x_1+x_2+x_3\\d=460m+90m+253m=803m$

the final velocity of the cheetah is zero because the cheetah decelerates until stop.

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Learn more about chemical equation,here:

brainly.com/question/28294176

#SPJ1

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