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3 years ago

_________ is what occurs when matter transitions between solid, liquid and gas

Physics

1 answer:

jonny [76]3 years ago

5 0

Answer:

Phase change

Explanation:

This term describes the changes of a state of matter between various states of aggregation without a change in its composition, that is, the transitions between solid, liquid, and gaseous states of matter, due to the effects of temperature and / or pressure.

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Green light shines through a 100-mm-diameter hole and is observed on a screen. If the hole diameter is increased by 20%, does th

Sergio [31]

I think it’s by 17 percent

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3 years ago

An object with a mass of 2 kg is moving with a velocity of 15 m/s.

7nadin3 [17]

KE= 1/2MV^2 - equation
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Hope this helps

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4 years ago

An aluminum sphere is 8.55 cm in diameter. What will be it's % change in volume if it is heated from 30 C to 155 C?

Ghella [55]

We know that

• The sphere diameter is 8.55 cm.

• The temperature change is from 30 C to 155 C.

First, we have to find the radius of the sphere. The radius is the half diameter.

$\begin{gathered} r=\frac{d}{2}=\frac{8.55\operatorname{cm}}{2} \\ r=4.275\operatorname{cm} \end{gathered}$

Now we have to find the volume of the sphere using the following formula.

$V=\frac{4}{3}\pi(r)^3$

Where r = 4.275 cm.

$\begin{gathered} V=\frac{4}{3}\pi(4.275\operatorname{cm})^3 \\ V\approx327.26(cm)^3 \end{gathered}$

Then, we use the following formula

$V_2-V_1=BV_0(T_2-T_1)$

Where the initial volume is 327.26 cubic cm, B is a constant about thermal expansion for aluminum, and we have to find the final volume to then calculate the percentage change.

$\begin{gathered} \Delta V=75\times10^{-6}\cdot327.26(155-30) \\ \Delta V=75\times10^{-6}\cdot327.26(125) \\ \Delta V\approx3.07(cm)^3 \end{gathered}$

This means that the volume change is 3.07 cubic centimeters.

At last, we have to divide the volume change by the initial volume, and then we have to multiply it by 100% to express it as a percentage.

$\frac{\Delta V}{V_1}\times100=\frac{3.07}{327.26}\times100\approx0.938$ <h2>Therefore, the percentage change is 0.938%.</h2>

5 0

1 year ago

Define one metre length

Tresset [83]

Answer:

The metre is currently defined as the length of the path travelled by light in a vacuum in 1299 792 458 of a second. The metre was originally defined in 1793 as one ten-millionth of the distance from the equator to the North Pole along a great circle, so the Earth's circumference is approximately 40000 km

3 0

3 years ago

Read 2 more answers

A power plant generates 150 MW of electrical power. It uses a supply of 1000 MW from a geothermal source and rejects energy to t

marissa [1.9K]

Answer:

- the power to the air is 850 MW

- mass flow rate of the air is 84577.11 kg/s

Explanation:

Given the data in the question;

Net power generated; $W_{net$ = 150 MW

Heat input; $Q_k$ = 1000 MW

Power to air = ?

For closed cycles

Power to air Q₀ = Heat input; $Q_k$ - Net power generated; $W_{net$

we substitute

Power to air Q₀ = 1000 - 150

Q₀ = 850 MW

Therefore, the power to the air is 850 MW

given that ΔT = 10 °C

mass flow rate of air required will be;

⇒ Q₀ / CpΔT

we know that specific heat of air at p=c ; Cp = 1.005 kJ/kg.K

we substitute

⇒ ( 850 × 10³ ) / [ 1.005 × 10 ]

⇒ ( 850 × 10³ ) / 10.05

⇒ 84577.11 kg/s

Therefore, mass flow rate of the air is 84577.11 kg/s

3 0

3 years ago