3 years ago

If an object stores kinetic energy, the object must be __________.

Physics

1 answer:

Darina [25.2K]3 years ago

6 0

Answer:

Moving

Explanation:

energy in the form of motion; depends on the mass and velocity of the object.

Have a good day!

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A grinding wheel is spinning with an initial angular velocity +ω0. When its motor is turned off at t=0, it begins to slow down w

Olegator [25]

Answer:

Explanation:

Given

initial angular velocity is $\omega _0$

when motor is turned of it started decelerating with $-\alpha$ angular acceleration

angle turned before coming to halt

$\omega ^2-\omega _0^2=2(\alpha )\theta$

here final angular velocity is zero

$-\omega _0^2=-2\alpha \theta$

$\theta =\frac{\omega _0^2}{2\alpha }$

No of revolutions will be $N=\frac{\theta }{2\pi }$

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B is the correct answer

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djyliett [7]

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4 years ago

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A rifle fires a 1.06 x 10-2-kg pellet straight upward, because the pellet rests on a compressed spring that is released when the

enyata [817]

Answer:

k = 2.65 10² N / m

Explanation:

As the pellets shoot up we can use energy conservation

Starting point. Compressed spring rifle

Em₀ = Ke = ½ k x²

Final point. Highest point of the path

$Em_{f}$ = U = m g y

Energy is conserved

Em₀ = Em_{f}

½ k x² = m g y

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Let's calculate

k = 2 1.06 10⁻² 9.8 6.26 / (6.61 10⁻²)²

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3 years ago