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IRINA_888 [86]
3 years ago
15

In class, we read an article about "Absolute Zero". Using what you know about particles/molecule motion, choose the option that

best represents the explanation of what absolute zero is.
Physics
2 answers:
Anna [14]3 years ago
7 0

Answer:

According to the options you gave, the answer is one

Explanation:

Absolute zero is defined by something being so cold the particles do not move

IgorC [24]3 years ago
5 0

Answer:

Absolute zero is where the particles/molecules are not moving at all, meaning that there is no heat.

This means that the answer is:

1. All particles are moving and this movement allows us to measure the thermal energy of an object or substance. If the particles were able to completely stop moving this would be called reaching absolute zero.

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21. A toy car starts from rest and begins to
Bond [772]

Answer:

v = 66 m/s

Explanation:

Given that,

The initial velocity of a car, u = 0

Acceleration of the car, a = 11 m/s²

We need to find the final velocity of the toy after 6 seconds.

Let v is the final velocity. It can be calculated using first equation of motion. It is given by :

v = u +at

v = 0 + 11 m/s² × 6 s

v = 66 m/s

So, the final velocity of the car is 66 m/s.

8 0
3 years ago
What percentage of the takeoff velocity did the plane gain when it reached the midpoint of the runway? a plane accelerates from
ElenaW [278]
When is at the end of the runway the velocity of the plane is given by the equation vf^{2}=0+2*a*s    where s=1800 m is the runway length. Thus
vf^{2}=2*5*1800=18000 (m/s)^{2}      
vf =134.164 (m/s)  

At half runway the velocity of the plane is
v^{2}=2*5* \frac{1800}{2}=9000 ( \frac{m}{s} )^{2}
 
v= \sqrt{9000}=94.87 ( \frac{m}{s})

Therefore at midpoint of runway the percentage of takeoff velocity is
‰P= \frac{v}{vf}=  \frac{94.87}{134.164}=0.707
6 0
3 years ago
Can a runner on a track be accelerating even if she is running at a constant speed why or why not
Lynna [10]
If the runner is running in a circular track then yes when something or someone is moving in a circular motion at a constant speed they are indeed accelerating. They’re accelerating because the direction of the velocity vector is changing
6 0
3 years ago
What time period is the child with two angels from?
oee [108]
I believe is was 1465. hope this helped!  
5 0
3 years ago
How is the acceleration of a car traveling on an elevated air track related to the angle of elevation and the height of elevatio
vitfil [10]

on a given inclined we know that net force is given by

F_{net} = - mgsin\theta

here we know that

F_{net} = ma

so here we have

ma = - mg sin\theta

a = - gsin\theta

so here acceleration depends directly on angle of inclination

now we also know that if height of the inclined is H and its length is L

then we can write

sin\theta = \frac{H}{L}

so the acceleration is given as

a = - g*\frac{H}{L}

so acceleration also depends directly on height of the inclined plane

4 0
3 years ago
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