<span>A mechanical wave is a wave that is not capable of transmitting its energy through a vacuum. Mechanical waves require a medium in order to transport their energy from one location to another. A sound wave is an example of a mechanical wave.</span>
Answer:
The advantage of the SI unit over CGS unit are:
- S.I has broader base. It has seven base units and two supplementary units.
- S.I is metric.
- S.I is coherent.
- S.I is rational, i.e. it gives one unit for one physical quantity .e g. for energy of any type i.e, mechanical or heat or electrical.There is only one unit Joule(J) but in M.K.S system unit for mechanical energy is joule.
<em><u>HOPE</u></em><em><u> </u></em><em><u>IT</u></em><em><u> </u></em><em><u>WILL</u></em><em><u> </u></em><em><u>HELP</u></em><em><u> </u></em><em><u>YOU</u></em>
Answer:
-5 m/s²
Explanation:
Acceleration = change in velocity / change in time
a = (v − v₀) / (t − t₀)
a = (-0.4 m/s − 0.6 m/s) / 0.2 s
a = -5 m/s²
The ball decelerates at a rate of -5 m/s².
The end or finish of an event or process.
To solve this problem it is necessary to apply the concepts related to the kinematic equations of angular motion.
By definition, acceleration can be expressed as the change in angular velocity squared over a given period of distance traveled.
![\alpha = \frac{\omega^2}{2\theta}](https://tex.z-dn.net/?f=%5Calpha%20%3D%20%5Cfrac%7B%5Comega%5E2%7D%7B2%5Ctheta%7D)
where,
Angular velocity
Angular displacement.
In turn, as a function of time, we can represent it as,
![\alpha = \frac{\omega}{t}](https://tex.z-dn.net/?f=%5Calpha%20%3D%20%5Cfrac%7B%5Comega%7D%7Bt%7D)
For our case we have to,
![\omega = 5.4rad/s](https://tex.z-dn.net/?f=%5Comega%20%3D%205.4rad%2Fs)
![\theta = 12.3rev = 12.3rev(\frac{2\pi rad}{1rev})=24.6\pi rad](https://tex.z-dn.net/?f=%5Ctheta%20%3D%2012.3rev%20%3D%2012.3rev%28%5Cfrac%7B2%5Cpi%20rad%7D%7B1rev%7D%29%3D24.6%5Cpi%20rad)
PART A) In the case of angular acceleration we have to,
![\alpha = \frac{\omega^2}{2\theta}](https://tex.z-dn.net/?f=%5Calpha%20%3D%20%5Cfrac%7B%5Comega%5E2%7D%7B2%5Ctheta%7D)
![\alpha = \frac{(5.4)^2}{2*24.6\pi}](https://tex.z-dn.net/?f=%5Calpha%20%3D%20%5Cfrac%7B%285.4%29%5E2%7D%7B2%2A24.6%5Cpi%7D)
![\alpha = 0.1886rad/s^2](https://tex.z-dn.net/?f=%5Calpha%20%3D%200.1886rad%2Fs%5E2)
PART B) Through the definition of angular acceleration as a function of time we can calculate it,
![\alpha = \frac{\omega}{t}](https://tex.z-dn.net/?f=%5Calpha%20%3D%20%5Cfrac%7B%5Comega%7D%7Bt%7D)
![t = \frac{\omega}{\alpha}](https://tex.z-dn.net/?f=t%20%3D%20%5Cfrac%7B%5Comega%7D%7B%5Calpha%7D)
![t = \frac{5.4}{0.1886}](https://tex.z-dn.net/?f=t%20%3D%20%5Cfrac%7B5.4%7D%7B0.1886%7D)
![t = 28.63s](https://tex.z-dn.net/?f=t%20%3D%2028.63s)