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Leviafan [203]
2 years ago
10

Ô tô có khối lượng 2500kg

Physics
1 answer:
Galina-37 [17]2 years ago
6 0

Answer:

  1. <em><u>jsksjsjsj</u></em><em><u>sjsjnznxosbdisnsjjwkjejwjkksoddjndomswsl</u></em><em><u> </u></em><em><u>2</u></em><em><u>.</u></em><u>qowoapoooen</u><u> </u><em>kwmwkkwmem</em><em><u> </u></em><em><u>make</u></em><em><u> </u></em><em><u>me</u></em><em><u> </u></em><em><u>laugh</u></em><em><u> </u></em><em><u>and</u></em><em><u> </u></em><em><u>get</u></em><em><u> </u></em><em><u>out</u></em><em><u> </u></em><em><u>with</u></em><em><u> </u></em><em><u>you</u></em><em><u>?</u></em><em><u>?</u></em><em><u> </u></em><em><u>edit</u></em><em><u>!</u></em><em><u> </u></em><em><u>thanks</u></em><em><u> </u></em><em><u>so</u></em><em><u> </u></em><em><u>I</u></em><em><u> </u></em><em><u>was</u></em><em><u> </u></em><em><u>just</u></em><em><u> </u></em><em><u>going</u></em><em><u> </u></em><em><u>through</u></em><em><u>.</u></em><em><u> </u></em><em><u>com</u></em><em><u> </u></em><em><u>for</u></em><em><u> </u></em><em><u>a</u></em><em><u> </u></em><em><u>few</u></em><em><u> </u></em><em><u>weeks</u></em><em><u> </u></em><em><u>before</u></em><em><u> </u></em><em><u>the</u></em><em><u> </u></em><em><u>game</u></em><em><u> </u></em><em><u>was</u></em><em><u> </u></em><em><u>so</u></em><em><u> </u></em><em><u>bad</u></em><em><u> </u></em><em><u>at</u></em><em><u> </u></em><em><u>the</u></em><em><u> </u></em><em><u>beginning</u></em><em><u> </u></em><em><u>but</u></em><em><u> </u></em><em><u>it</u></em><em><u> </u></em><em><u>is</u></em><em><u> </u></em><em><u>amazing</u></em><em><u> </u></em><em><u>how</u></em><em><u> </u></em><em><u>many</u></em><em><u> </u></em><em><u>things</u></em><em><u> </u></em><em><u>are</u></em><em><u> </u></em><em><u>the</u></em><em><u> </u></em><em><u>same</u></em><em><u> </u></em><em><u>with</u></em><em><u> </u></em><em><u>the</u></em><em><u> </u></em><em><u>rest</u></em><em><u>.</u></em><em><u> </u></em><em><u>so</u></em><em><u> </u></em><em><u>the</u></em><em><u> </u></em><em><u>way</u></em><em><u> </u></em><em><u>that</u></em><em><u> </u></em><em><u>they</u></em><em><u> </u></em><em><u>want</u></em><em><u> </u></em><em><u>a</u></em><em><u> </u></em><em><u>new</u></em><em><u> </u></em><em><u>one</u></em><em><u>?</u></em><em><u> </u></em><em><u>the</u></em><em><u> </u></em><em><u>best</u></em><em><u> </u></em><em><u>of</u></em><em><u> </u></em><em><u>you</u></em><em><u> </u></em><em><u>for</u></em><em><u> </u></em><em><u>this</u></em>
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You stand on a frictional platform that is rotating at 1.1 rev/s. Your arms are outstretched, and you hold a heavy weight in eac
bezimeni [28]

Answer:

a) The resulting angular speed of platform is 1.38 rev/sec

b) The change in kinetic energy of the system is 53 J.

Explanation:

This question is incomplete. The complete question will be:

You stand on a frictional platform that is rotating at 1.1 rev/s. Your arms are outstretched, and you hold a heavy weight in each hand. The moment of inertia of you, the extended weights, and the platform is 8.8 kg · m2. When you pull the weights in toward your body, the moment of inertia decreases to  7.0 k g .m 2  

a) What is the resulting angular speed of the platform? Answer in units of r e v / s .

b)What is the change in kinetic energy of the system? Answer in units of J.

<h3>ANSWER:</h3>

a)

we know that:

Angular Momentum = L = Iω

From conservation of momentum:

Lo = Lf

(Io) (ωo) = (If) (ωf)

ωf = (Io) (ωo)/(If)

ωf = (8.8 kg.m²)(1.1 rev/s)/(7.0 kg.m²)

<u>ωf = 1.38 rev/sec =</u>

b)

ωf = (1.38 rev/sec)(2π rad/ 1 rev) = 8.67 rad/sec

ωo = (1.1 rev/sec)(2π rad/ 1 rev) = 6.91 rad/sec

The kinetic energy for rotational motion is given as:

K.E = (1/2)Iω²

Thus, the change in kinetic energy will be:

ΔK.E = (K.E)f - (K.E)o

ΔK.E = (1/2)Ifωf² - (1/2)Ioωo²

ΔK.E = (1/2)(Ifωf² - Ioωo²)

ΔK.E = (1/2)[(7 kg.m²)(8.67 rad/sec)² - (8.8 kg.m²)(6.91 rad/sec)²

<u>ΔK.E = 53 J</u>

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Pulling up on a rope, you lift a 4.25 kg bucket of water from a well with an acceleration of 1.80 m/s2 . What is the tension in
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Answer:

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Explanation:

Given that Pulling up on a rope, you lift a 4.25 kg bucket of water from a well with an acceleration of 1.80 m/s2 . What is the tension in the rope?

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Weight = 4.25 × 9.8

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The tension and the weight will be opposite in direction.

Total force = ma

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