I racked my brain for almost 10 minutes, until suddenly,
it hit me !
You're breathing one right now ! So am I .
Air is a mixture of a lot of elements.
Nitrogen, Oxygen, and Argon account for 99.964 percent.
The other 0.036 percent is mainly Neon, Helium, Krypton,
and Hydrogen ... more elements.
Then there are Carbon Dioxide and water vapor.
Yes, those are compounds. But together, they add up
to very little of the air we breathe, and if both of them
suddenly disappeared, we would hardly notice it.
Answer:
7.8 J/g °C
Explanation:
0.39 J/g °C x 200 J / 10g
= 7.8 J/g °C
Using the idea of work done under gravity, the height of the building is 187 m.
<h3>Work done in a gravitational field</h3>
We must recall that the work done in a gravitational field is given by; mgh
m= mass
g = acceleration due to gravity
h = height
mass = 60.0 kg
Workdone = 1.15x10^5 J
W = mgh
h = W/mg
h = 1.15x10^5 J/60.0 kg * 9.8 ms-2
h = 187 m
Learn more about work done: brainly.com/question/13662169?
The speed of the car is 75 km/h
<h3>Further explanation</h3>
These are the formulas that we have to remember before solving the problem.
Speed is the rate of change of distance.
![\large { \boxed {v = \frac{d}{t}}}](https://tex.z-dn.net/?f=%5Clarge%20%7B%20%5Cboxed%20%7Bv%20%3D%20%5Cfrac%7Bd%7D%7Bt%7D%7D%7D)
<em>v = speed ( m/s )</em>
<em>d = distance ( m )</em>
<em>t = time ( s )</em>
Acceleration is the rate of change of velocity.
![\large { \boxed {a = \frac{\Delta v}{t}}}](https://tex.z-dn.net/?f=%5Clarge%20%7B%20%5Cboxed%20%7Ba%20%3D%20%5Cfrac%7B%5CDelta%20v%7D%7Bt%7D%7D%7D)
<em>a = acceleration ( m/s² )</em>
<em>Δv = change in speed ( m/s )</em>
<em>t = time ( s )</em>
Let us now tackle the problem!
<u>Given:</u>
distance = d = 150 km
time taken = t = 7200 s = 2 hours
<u>Unknown:</u>
velocity = v = ?
<u>Solution:</u>
![v = \frac{d}{t}](https://tex.z-dn.net/?f=%20v%20%3D%20%5Cfrac%7Bd%7D%7Bt%7D%20)
![v = \frac{150}{2}](https://tex.z-dn.net/?f=%20v%20%3D%20%5Cfrac%7B150%7D%7B2%7D%20)
![\large {\boxed {v = 75~km/h} }](https://tex.z-dn.net/?f=%20%5Clarge%20%7B%5Cboxed%20%7Bv%20%3D%2075~km%2Fh%7D%20%7D%20)
The acceleration of the car is 0 m/s² because it travels with constant speed.
We could also plot the distance vs time graph as shown in the attachment.
<h3>Learn more</h3>
<h3>Answer details</h3>
Grade: Middle School
Subject: Physics
Chapter: Kinematics
Keywords: indycar top speed of a fastest police car has ever gone
To solve this problem it is necessary to apply the concepts related to Torque and Inertia.
Torque is defined as the force applied to a given distance radius, that is
![\tau = F*r](https://tex.z-dn.net/?f=%5Ctau%20%3D%20F%2Ar)
Replacing with our vales we have that
![\tau = 5*0.8](https://tex.z-dn.net/?f=%5Ctau%20%3D%205%2A0.8)
![\tau = 4N.m](https://tex.z-dn.net/?f=%5Ctau%20%3D%204N.m)
On the other hand the definition of Inertia defines us that it is inversely proportional to angular acceleration and proportional to torque, that is to say
![I = \frac{\tau}{\alpha}](https://tex.z-dn.net/?f=I%20%3D%20%5Cfrac%7B%5Ctau%7D%7B%5Calpha%7D)
![I = \frac{4}{2}](https://tex.z-dn.net/?f=I%20%3D%20%5Cfrac%7B4%7D%7B2%7D)
![I = 2 kg.m^2](https://tex.z-dn.net/?f=I%20%3D%202%20kg.m%5E2)