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3 years ago

A thermometer that uses a liquid to measure temperature works because

2 answers:

6 0

The liquid in a thermometer is sometimes colored alcohol but can also be a metallic liquid called mercury. Mercury and alcohol expand when heated and shrink when cooled. Inside the glass tube of a thermometer, the liquid has no place to go but up when the temperature is hot and down when the temperature is cold. That's how a thermometer that uses liquid to measure temperature.

PSYCHO15rus [73]3 years ago

5 0

A rule of thumb is that liquid expands when heated, so when liquid is in a given space one can measure how far the liquid moves when it gets heated.

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I'm hooke's law F=kx, what does the k stand for

Snezhnost [94]

<span>F = kX</span>, where k is a constant factor characteristic of the spring: its stiffness, and X is small compared to the total possible deformation of the spring.

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3 years ago

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Which of these would most likely cause a sound wave?

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Among the choices the one that most likely cause a sound wave is C or the a spoon hitting the side of a bowl while mixing <span>because that's going to make a sound.

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3 years ago

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A cylinder contains a mixture of helium and argon gas in equilibrium at 160°C.

Artist 52 [7]

Answer:

a. E=8.97*10^{-21} J

b. v-He2 = 1.161 km/s

v-Ar2 = 369.74 m/s

Explanation:

(a) The average kinetic energy is given by

$E_k=\frac{1}{2}k_BT$

where KB is the Boltzman's constant and T is the temperature. For each molecule we have:

$E_k=\frac{3}{2}(1.38066*10^{-23}\frac{J}{K})(433.15K)=8.97*10^{-21}J$

is the same for both type of molecules because is independent of the mass

(b)

$v_{rms}=\sqrt{\frac{3RT}{M}}$

where R is the constant of ideal gases, and M is the mass of the molecule. BY replacing for each type of molecule we obtain:

$v_{rms-He_{2}}=\sqrt{\frac{3(8.311434Jmol^{-1}K^{-1})(433.15K)}{0.008kg\ mol^{-1}}}=1161.9\frac{m}{s}\\\\v_{rms-Ar_{2}}=\sqrt{\frac{3(8.311434Jmol^{-1}K^{-1})(433.15K)}{0.079kg\ mol^{-1}}}=369.74\frac{m}{s}$

v-He2 = 1.161 km/s

v-Ar2 = 369.74 m/s

hope this helps!!

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3 years ago

In the form of radioactive decay known as alpha decay, an unstable nucleus emits a helium-atom nucleus, which is called an alpha

trapecia [35]

Answer:

Velocity will be $v=4.06\times10^7m/sec$

Explanation:

We have given mass of alpha particle m = 4 u $=4\times 1.67\times 10^{-27}kg=6.68\times 10^{-27}kg$

Charge on alpha particle $q=2e=2\times 1.6\times 10^{-19}C=3.2\times 10^{-19}C$

Charge on thorium particle $=90\times 1.6\times 10^{-19}=144\times 10^{-19}C$

Diameter is given as d = 15 fm

So radius $r=\frac{d}{2}=\frac{15}{2}=7.5fm=7.5\times 10^{-15}m$

Potential energy is given by $E=\frac{1}{4\pi \epsilon _0}\frac{q_1q_2}{r}=\frac{Kq_1q_2}{r}=\frac{9\times 10^9\times 144\times 10^{-19}\times 3.2\times 10^{-19}}{7.5\times 10^{-15}}=5.529\times 10^{-12}J$

From energy conservation $\frac{1}{2}mv^2=5.529\times 10^{-12}$

$\frac{1}{2}\times 6.68\times 10^{-27}v^2=5.529\times 10^{-12}$

$v=4.06\times10^7m/sec$

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3 years ago

which of these changes does a submarine encounter as it returns from the bottom of the ocean to the surface of the ocean? a. the

Lady bird [3.3K]

The amount of sunlight increases

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3 years ago

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