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Darya [45]
3 years ago
7

A student pushes a 12 kg block on a frictionless horizontal surface if the block is initially at rest what is the speed of the b

lock after the student pushes the block for five seconds with an acceleration of 2 m/s squared
Physics
1 answer:
Lina20 [59]3 years ago
4 0

Answer:

20N

Explanation:

Given parameters:

Mass of the block  = 4kg

Acceleration  = 5m/s²

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A playground merry-go-round of radius R = 1.20 m has a moment of inertia I = 240 kg · m2 and is rotating at 9.0 rev/min about a
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Answer:

ω' = 0.815 rad/s

Explanation:

Given,

R = 1.20 m

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angular speed of the merry-go-round=?

we know

Angular momentum, L = I ω

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Conservation of angular momentum

initial angular momentum = Final angular momentum

I ω = (I+I')ω'

240 x 0.9424 = (240+37.44) ω'

226.176= 277.44 ω'

ω' = 0.815 rad/s

new angular speed of the merry-go- round is equal to 0.815 rad/s

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4 years ago
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