Answer:
![n=4.5\times 10^{13}](https://tex.z-dn.net/?f=n%3D4.5%5Ctimes%2010%5E%7B13%7D)
Explanation:
Initial charge, ![q_1=10\mu C](https://tex.z-dn.net/?f=q_1%3D10%5Cmu%20C)
After conduction, charge on the body becomes, ![q_2=-2.8\mu C](https://tex.z-dn.net/?f=q_2%3D-2.8%5Cmu%20C)
We need to find the number of electrons gained by this charged body.
Net charge,
![q=q_1+q_2\\\\=10+(-2.8)\\\\=7.2\ \mu C](https://tex.z-dn.net/?f=q%3Dq_1%2Bq_2%5C%5C%5C%5C%3D10%2B%28-2.8%29%5C%5C%5C%5C%3D7.2%5C%20%5Cmu%20C)
Let n be the number of electrons gained by this charged body. So,
![q=ne\\\\n=\dfrac{q}{e}\\\\n=\dfrac{7.2\times 10^{-6}}{1.6\times 10^{-19}}\\\\=4.5\times 10^{13}](https://tex.z-dn.net/?f=q%3Dne%5C%5C%5C%5Cn%3D%5Cdfrac%7Bq%7D%7Be%7D%5C%5C%5C%5Cn%3D%5Cdfrac%7B7.2%5Ctimes%2010%5E%7B-6%7D%7D%7B1.6%5Ctimes%2010%5E%7B-19%7D%7D%5C%5C%5C%5C%3D4.5%5Ctimes%2010%5E%7B13%7D)
So,
electrons gained by this charged body.
The component that could Chang leave out and still light up the bulb is the switch.
Answer: i believe its chemical change or thermal depends on the question answers
Answer:
![\vec{v}_1 = -\frac{\vec{v}_2m_2}{m_1}](https://tex.z-dn.net/?f=%5Cvec%7Bv%7D_1%20%3D%20-%5Cfrac%7B%5Cvec%7Bv%7D_2m_2%7D%7Bm_1%7D)
Explanation:
The center of mass of the system (two girls) is constant, as the velocity of the center of mass of the system is also constant.
![\vec{v}_{cm} = \frac{m_1\vec{v}_1 + m_2\vec{v}_2}{m_1 + m_2}](https://tex.z-dn.net/?f=%5Cvec%7Bv%7D_%7Bcm%7D%20%3D%20%5Cfrac%7Bm_1%5Cvec%7Bv%7D_1%20%2B%20m_2%5Cvec%7Bv%7D_2%7D%7Bm_1%20%2B%20m_2%7D)
<u>The initial velocity of the system is zero, since both girls are at rest.</u> So the velocity of the total system at any point should be zero as well.
![0 = \frac{m_1\vec{v}_1 + m_2\vec{v}_2}{m_1 + m_2}\\\vec{v}_1 = -\frac{\vec{v}_2m_2}{m_1}](https://tex.z-dn.net/?f=0%20%3D%20%5Cfrac%7Bm_1%5Cvec%7Bv%7D_1%20%2B%20m_2%5Cvec%7Bv%7D_2%7D%7Bm_1%20%2B%20m_2%7D%5C%5C%5Cvec%7Bv%7D_1%20%3D%20-%5Cfrac%7B%5Cvec%7Bv%7D_2m_2%7D%7Bm_1%7D)
This is true, because there is no friction between the girls and the ground. Otherwise, the velocity of the center of mass wouldn't be constant.
Well, basically both Cheryl and Keaton is right.
matter is described as Physical substance that possessed space and mass.
But the thing is, one matter is very small in size and cannot be seen with naked eyes. But everything around us are made by matters
hope this helps