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2 years ago

Atoms and molecules in matter are always_______

Physics

2 answers:

Troyanec [42]2 years ago

8 0

Answer:

in motion.

Explanation:

In chemistry, we often explain the states of matter in terms of the kinetic molecular theory (KMT). The word kinetic refers to motion and the kinetic molecular theory suggests that atoms and molecules are always in motion. The energy associated with this motion is termed kinetic energy.

Point out the following about solids: The particles (atoms or molecules) are attracted to each other. The particles (atoms or molecules) vibrate but do not move past one another. The solid retains its shape.

They are not always in motion. They are always in motion if and only if the temperature of the surroundings is greater than absolute zero ( 0 K ).

Not only are molecules really small but they are in constant motion. The motion is called “thermal motion” because it's caused by temperature. Increase the temperature around them and the molecules move faster.

Lesechka [4]2 years ago

7 0

I think atoms and molecules in matter are always in motion because of kinetic energy.

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How big is the international space station?

oee [108]

The dimensions of the completed ISS research facility will be approximately 356 feet (109 meters) by 240 feet (73 meters), or slightly larger than a football field. the ISS weighes around 450 tons (408,000 kg), or 450 times the weight of an average car.

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3 years ago

180 cm3 of hot tea at 97 °C are poured into a very thin paper cup with 20 g of crushed ice at 0 °C. Calculate the final temperat

Zolol [24]

Answer : The final temperature of the mixture is $91.9^oC$

Explanation :

First we have to calculate the mass of water.

Mass = Density × Volume

Density of water = 1.00 g/mL

Mass = 1.00 g/mL × 180 cm³ = 180 g

In this problem we assumed that heat given by the hot body is equal to the heat taken by the cold body.

$q_1=-q_2$

$m_1\times c_1\times (T_f-T_1)=-m_2\times c_2\times (T_f-T_2)$

where,

$c_1$ = specific heat of hot water (liquid) = $4.18J/g^oC$

$c_2$ = specific heat of ice (solid)= $2.10J/g^oC$

$m_1$ = mass of hot water = 180 g

$m_2$ = mass of ice = 20 g

$T_f$ = final temperature of mixture = ?

$T_1$ = initial temperature of hot water = $97^oC$

$T_2$ = initial temperature of ice = $0^oC$

Now put all the given values in the above formula, we get

$(180g)\times (4.18J/g^oC)\times (T_f-97)^oC=-(20g)\times 2.10J/g^oC\times (T_f-0)^oC$

$T_f=91.9^oC$

Therefore, the final temperature of the mixture is $91.9^oC$

8 0

3 years ago

What is the wavelength of the sound you hear as a train

NeX [460]

As the train blows its whistle towards you, the wavelength is shorter than the sound of the whistle at rest.

<h3>What is wavelength?</h3>

Wavelength is the distance traveled by a wave in a given period of time.

Relationship between wavelength, speed and frequency of sound

v = fλ

where;

v is the speed of the sound
f is the frequency of the sound
λ is the wavelength of the sound

As the frequency of the sound increases, the wavelength of the sound decreases.

Thus, as the train blows its whistle towards you, the wavelength is shorter than the sound of the whistle at rest.

Learn more about wavelength here: brainly.com/question/10728818

3 0

1 year ago

You have a 5 V power source, a 25 W resistor, a 50 W resistor, and some wire. Clearly identify the formula(s) you are using, and

11111nata11111 [884]

Answer:

Explanation:

given,

Power source = 5 V

R₁ = 25 Ω

R₂ = 50 Ω

a) when they are arranged in series

R = R₁ + R₂

R = 25 + 50

R = 75 Ω

b) current = I = $\dfrac{V}{R}$

I = $\dfrac{5}{75}$

I = 0.067 A

so, the resistors are connected in series hence current in both the resistor will be 0.067 A.

c) when they are arranged in parallel

$\dfrac{1}{R} = \dfrac{1}{R_1} + \dfrac{1}{R_2}$

$\dfrac{1}{R} = \dfrac{1}{25} + \dfrac{1}{50}$

R = 16.67 Ω

d) current through the battery $I = \dfrac{V}{R}$

$I = \dfrac{5}{16.67}$ = 0.3 A

current through 25 Ω resistor = $\dfrac{V}{R} = \dfrac{5}{25} = 0.2 A$

current through 50 Ω resistor = $\dfrac{V}{R} = \dfrac{5}{50} = 0.1 A$

5 0

3 years ago

Melissa and Rory live near a bike trail, 21 km apart. They plan to meet at a park mid-way between their homes. They start from t

DiKsa [7]

Answer:

27km.

Explanation:

Jessie will run for a duration of time, which is the time it takes for Melissa and Rory to meet each other.

Together combined, Melissa and Rory runs at 14km/h. The bike trail is 21km, so it will take 1.5 hours.

Jessie runs at 18km/h, so Jessie will run 18 * 1.5 = 27km.

7 0

3 years ago