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3 years ago

Consider this statement: Air is matter. Which facts best support the statement?

Physics

2 answers:

lyudmila [28]3 years ago

7 0

A. Balloons can be filled with air.
C. Air has mass.

lara31 [8.8K]3 years ago

5 0

Explanation:

Anything that occupies space and has mass is known as matter. Matter can be solid state, liquid state or gaseous state.

For example, air is a mixture of gases. Also, it has mass and occupies space. Thus, air is matter.

Thus, we can conclude that the statements balloons can be filled with air and air has mass shows air is matter.

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If a car has a momentum of 1000kgm/s and<br> velocity of 500m/s, what is its mass

Dvinal [7]

Answer:

hey u apply p=mv and 2 are given then calculate thirds value it's a simple do it

7 0

3 years ago

Older railroad tracks in the U.S. are made of 12 m-long pieces of steel. When the tracks are laid, gaps are left between the sec

Shkiper50 [21]

Answer:

0.005 m

Explanation:

length of steel (L°) = 12 m

initial temperature (T) = 16 degrees

expected temperature (T') = 50 degrees

We can find how large the gaps should be if the track is not to buckle when the temperature is as high as 50 degrees from the formula below

ΔL = ∝L°ΔT where

ΔL = expansion / gap
∝ = linear expansion coefficient of steel = $12x10^{-6} C^{-1}$
L° = initial length
ΔT = change in temperature

ΔL = $12x10^{-6}$ x 12 x (50-16) = 0.005 m

3 0

4 years ago

At what angle should the axes of two polaroids be placed so as to reduce the intensity of the incident unpolarized light to 13.

prohojiy [21]

Answer:

θ = 66.90°

Explanation:

we know that

$I= \frac{I_0}{2}cos^2\theta$

I= intensity of polarized light =1

I_o= intensity of unpolarized light = 13

putting vales we get

$1= \frac{13}{2}cos^2\theta$

⇒ $\theta=cos^{-1} \sqrt{\frac{1}{6.5} }$

therefore θ = 66.90°

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3 years ago

A 4400 W motor is used to do work. If the motor is used for 200 s, how much work could it do? (Power: P = W/t)

Inga [223]

Hope this helps, have a great day ahead!

7 0

3 years ago

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A bowling ball has a mass of 5 kg. What happens to its momentum when the speed increases from 1 m/s to 2 m/s?

Alona [7]

<span>The initial momentum is 5 kg m/s and the final momentum is 10 kg m/s

'cause P = m*v, when we increase either m or v, P also increases by the same expression,

P = 5 * 2 = 10

So, option D is your answer!!

Hope this helps!

</span>

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3 years ago

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