Answer:![\mu =0.13](https://tex.z-dn.net/?f=%5Cmu%20%3D0.13)
Explanation:
Given
mass of couch ![m=1\times 10^2 kg](https://tex.z-dn.net/?f=m%3D1%5Ctimes%2010%5E2%20kg)
acceleration of couch ![a=0.79 m/s^2](https://tex.z-dn.net/?f=a%3D0.79%20m%2Fs%5E2)
inclination ![\theta =12^{\circ}](https://tex.z-dn.net/?f=%5Ctheta%20%3D12%5E%7B%5Ccirc%7D)
Let coefficient of kinetic Friction
as couch begins to slides Forces act on couch
, where
is friction force
![mg\sin \theta -\mu mg\cos \theta =ma](https://tex.z-dn.net/?f=mg%5Csin%20%5Ctheta%20-%5Cmu%20mg%5Ccos%20%5Ctheta%20%3Dma)
therefore net acceleration is
![a=g\sin \theta -\mu g\cos \theta](https://tex.z-dn.net/?f=a%3Dg%5Csin%20%5Ctheta%20-%5Cmu%20g%5Ccos%20%5Ctheta%20)
![0.79=9.8\cdot \sin (12)-\mu g\cos (12)](https://tex.z-dn.net/?f=0.79%3D9.8%5Ccdot%20%5Csin%20%2812%29-%5Cmu%20g%5Ccos%20%2812%29)
![0.08061=0.2079-\mu 0.9781](https://tex.z-dn.net/?f=0.08061%3D0.2079-%5Cmu%200.9781)
![\mu (0.9781)=0.1272](https://tex.z-dn.net/?f=%5Cmu%20%280.9781%29%3D0.1272)
![\mu =\frac{0.1272}{0.9781}](https://tex.z-dn.net/?f=%5Cmu%20%3D%5Cfrac%7B0.1272%7D%7B0.9781%7D)
![\mu =0.13](https://tex.z-dn.net/?f=%5Cmu%20%3D0.13)
Answer:
D. It uses boron so that electrical conduction is due to the movement of a positive charge.
Explanation:
Please mark me brainliest
Hey there!
<span>How much kinetic energy does a care 1000 kg car moving at 7 m/s have?
Answer:
</span><span>A. 24500 J
Hope this helps
Have a great day (:
</span>
Answer:
i would like to help you but I can't help you i don't understand the question and i don't speak Spanish