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2 years ago

9

You kick a soccer ball with a mass of 2 kg. The ball leaves your foot with a speed of 30 m/s. How much kinetic energy does the b

all have?

2 answers:

____ [38]2 years ago

8 0

900 J is your answer :)

Lyrx [107]2 years ago

7 0

Answer:

KE= 900 (I think)

Explanation:

KE=½mv²

KE= ½(2)(30)²

KE=½(60)²

KE=30²

KE=900

Hope this helps!

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An atom has seven protons, eight neutrons, and six electrons. What type of electrical charge does it possess?

Crank

Answer:

positive

Explanation:

No. of positive charge= 7

No.of negative charge = 6

so 7 - 6 = 1 positive charge

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3 years ago

A thin disk of mass 2.2 kg and radius 61.2 cm is suspended by a horizonal axis perpendicular to the disk through its rim. The di

Alinara [238K]

Answer: The period of the subsequent simple harmonic motion is 1.004 sec.

Explanation:

The given data is as follows.

Mass of disk (m) = 2.2 kg, radius of the disk (r) = 61.2 cm,

Formula to calculate the moment of inertia around the center of mass is as follows.

$I_{cm} = \frac{1}{2}mr^{2}$

= $\frac{1}{2} \times 2.2 kg \times (61.2)^{2}$

= 0.412 $kg m^{2}$

Also,

Distance between center of mass and axis of rotation (d) = r = 0.612 m

Moment of inertia about the axis of rotation (I)

I = $I_{cm} + md^{2}$

I = $0.412 + (2.2) \times (0.612)^{2}$

= 0.339 $kgm^{2}$

Now, we will calculate the time period as follows.

T = $2\pi sqrt{\frac{I}{mgd})$

T = $2 \times 3.14 sqrt{(\frac{0.339}{2.2 \times 9.8 \times 0.612}$

T = 1.435 sec

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Thus, we can conclude that the period of the subsequent simple harmonic motion is 1.004 sec.

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2 years ago

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Answer:

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Explanation:

The heat that is required to make a phase change is known as latent heat.

A phase change occurs when matter changes state. For example from solid to liquid, from liquid to gas, among others.

When changing from liquid to gas (for example when water evaporates), the heat necessary for this to happen is called latent heat of vaporization. The word latent means hidden, because a change in temperature is not perceived during the phase change, even when heat is being added, thus it is said that the heat is hidden or latent.

So the answer is:

Energy absorbed or hidden when water evaporates.

*Another type of latent heat is the latent heat of fusion, which is when a solid becomes liquid.

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3 years ago

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Answer:

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2 years ago

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