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3 years ago

Why do we use mercury in thermometer

Physics

1 answer:

viktelen [127]3 years ago

4 0

Answer:

Mercury is the only one in liquid state at room temperature. It's used in thermometers because it has high coefficient of expansion. It also has a high boiling point which makes it very suitable to measure higher temperatures. Also, it has a shiny appearance and doesn't stick to the glass surface of glass.

Explanation:

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What is general relativity

juin [17]

General relativity is a theory of space and time. The theory was published by Albert Einstein in 1915. The central idea of general relativity is that space and time are two aspects of spacetime. Spacetime is curved when there is gravity, matter, energy, and momentum.

5 0

3 years ago

You hear the sound of the firing of a distant cannon 6.9 s after seeing the flash. how far are you from the cannon? (assume 343

EastWind [94]

Let's call d the distance of the cannon from us. We see the flash first, then after 6.9 s we hear the sound. The flash arrives to us traveling at speed of light, which is $c=3 \cdot 10^8 m/s$ , while the sound travels at speed $v=343 m/s$ . Since the magnitude of the speed of light is much much larger than the speed of sound, we can assume that the flash arrives at our location instantaneously after the firing.
Then we can say that the sound wave covers a distance d traveling at speed v in a time of t=6.9 s. Since it is a uniformly linear motion, the distance covered by the sound wave is
$d=vt=(343 m/s)(6.9 s)=2367 m$
So, this is the distance of the cannon from us.

6 0

3 years ago

The law of reflection states that if the angle of incidence is 62 degrees, the angle of reflection is degrees.

Naya [18.7K]

The law of reflection states that "when a ray of light is reflected off a surface, the angle of incidence equals to the angle of reflection"

The angle of incidence is 62° means the angle of reflection is also 62°

4 0

3 years ago

If there are 1,600 meters in a mile, find the speed of sound in this experiment in units of "miles / hour"

atroni [7]

Answer:

v = 771.75 mile / h

Explanation:

The speed of sound is v = 343 m / s at T= 20C

the transformation ratios are

1 mile = 1600 m

1 h = 3600 s

Let's reduce

v = 343 m / s (1 mile / 1600 m) (3600 s / 1 h)

v = 771.75 mile / h

4 0

3 years ago

What property of matter changes depending on location?

Angelina_Jolie [31]

Answer:

weight. The force with which an object near the Earth or another celestial body is attracted toward the center of the body by gravity. An object's weight depends on its mass and the strength of the gravitational pull.

Explanation:

This may be right i'm not 100%

8 0

3 years ago

Why do we use mercury in thermometer​

Why do we use mercury in thermometer