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3 years ago

Which temperature scale has no negative temperatures A. Celsius B. Joule C. Fahrenheit D. Kelvin

Physics

2 answers:

vodomira [7]3 years ago

7 0

Kelvinnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn

Brilliant_brown [7]3 years ago

6 0

The Kelvin scale has no negatives on it.

Zero Kelvin is 'Absolute Zero', and nothing can get colder than that.

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The horn on a commuter train emits sound with a frequency of 342.5 Hz when the train is at rest. The train sounds its horn as it

inna [77]

Answer:

Δf = -82.57 Hz

Explanation:

For this problem we will use Doppler effect formula:

$f = \frac{C+Vr}{C+Vs}*fo$ where:

C is the speed of sound

Vr is the velocity of the person = 0m/s

Vs is the velocity of the source (train): When approaching Vs = -41m/s and when receding Vs = 41m/s

fo = 342.5 Hz

When the train is approaching:

$fa = \frac{C}{C+Vs}*fo = \frac{345}{345-41}*342.5=388.69Hz$

And when the train is receding:

$fr = \frac{C}{C+Vs}*fo = \frac{345}{345+41}*342.5=306.12Hz$

So, the change of frequency will be:

Δf = fr - fa = 306.12 - 388.69 = -82.57 Hz

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4 years ago

What is the difference between a compressional wave with a large amplitude and one with a small amplitude?

rosijanka [135]

A larger amplitude means a smaller sound and a smaller amplitude means a larger sound.

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3 years ago

Which gas in Earth's atmosphere has increased over time due to burning fossil fuels?

astraxan [27]

The answer is Carbon Dioxide

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3 years ago

Read 2 more answers

Three equal 1.55-μC point charges are placed at the corners of an equilateral triangle whose sides are 0.500 m long. What is the

kati45 [8]

Answer:

0.12959085 J

Explanation:

k = Coulomb constant = $8.99\times 10^{9}\ Nm^2/C^2$

q = Charge = 1.55 μC

d = Distance between charge = 0.5 m

Electric potential energy is given by

$U=k\dfrac{q^2}{d}$

In this system with three charges which are equidistant from each other

$U=k\dfrac{q^2}{d}+k\dfrac{q^2}{d}+k\dfrac{q^2}{d}$

$\\\Rightarrow U=k\dfrac{3q^2}{d}\\\Rightarrow U=8.99\times 10^9\times \dfrac{3\times (1.55\times 10^{-6})^2}{0.5}\\\Rightarrow U=0.12959085\ J$

The potential energy of the system is 0.12959085 J

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3 years ago

Describe a simple experiment to verify the principle of moments

liubo4ka [24]

Use a ruler, a pivot, some weights. set the experiment by putting the pivot then a ruler on top of it finally put the wights on each end of the ruler

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4 years ago