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marshall27 [118]
3 years ago
5

Which metal is liquid at room temperature?

Physics
2 answers:
White raven [17]3 years ago
7 0
D. mercury.............
Paul [167]3 years ago
5 0
Mercury will be our answer.

As we know, our lovely thermometers contain mercury (mostly old fashioned kinds now), and the only way that we could see the temperature through a thermometer was by seeing the liquid inside of the thermometer rise and fall. If mercury were to be a solid, then it wouldn't be able to rise or fall.
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What is the wavelength of a radar signal that has a frequency of 27 GHz? The speed of light is 3 × 108 m/s. Answer in units of m
marusya05 [52]

Explanation:

speed of light= c

wave length= L

frequency= f

c=Lf → L= c/f → L= 3 × 10⁸/ 27 × 10⁹ → L = 1/90 ≈ 0.011 m

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2 years ago
Which two statements are true about a system?
shusha [124]
A and c

Because it defines the boundaries of the system
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3 years ago
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Suppose you take a trip that covers 180 km and takes 3 hours to make. Your average speed is A. 30 km/h. B. 60 km/h. C. 180 km/h.
Ivenika [448]
B. 60 kilometers per hour
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3 years ago
Desde el balcón de un edificio se deja caer una manzana y llega a la planta baja en 5 s. ¿Desde qué piso se dejó caer, si cada p
miv72 [106K]

Answer: 42

Explanation:

I will answer this in English.

We know that the apple needs 5 seconds to reach the ground.

Each floor of the building has a height of 2.88m.

Now, when we drop something, the only force acting on the object is the gravitational one, so the acceleration of the apple is:

a = -g

for the velocity, we integrate the acceleration over time, and as the apple is dropped, we do not have any initial velocity, so we do not have a constant in the integration:

v = -g*t

for the position we integrate again, now we have an initial height H, so the position is:

p = (-g/2)*t^2 + H

now the apple hits the ground when p = 0, so we can solve this equation to find H.

i will use g = 9.8m/s^2

0 = (-4.9m/s^2)*(5s)^2 + H  

H = 122.5 m

now knowing H, we can divide it by the height of a floor in the building and get the number of the floor.

N = 122.5m/2.88m = 42.5

this means that the apple was dropped in the floor 42 (the 0.5 means that the apple was not right where the floor 42 starts, it was dropped around the middle of the floor 42)

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2 years ago
Select the correct answer. Which of the following causes air pollution inside the house? A. Smoking cigarettes B. Growing housep
Troyanec [42]

Answer: Smoking cigarettes

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3 0
2 years ago
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