The correct answer is
A. The mechanical energy transforms to thermal energy as the pendulum slows and eventually stops moving.
In fact, we must keep in mind the presence of the air, which causes some resistance to the motion of the pendulum. As the pendulum moves through the air, part of its mechanical energy is transferred to the molecules of air because of the friction of this molecules with the surface of the pendulum. As a result, the pendulum slows down, and eventually stops. The initial energy of the pendulum has been converted into thermal energy of the molecules of air, which move faster now.
Answer:
Workdone = 0.05Joules
Explanation:
The side of a square =a= 0.510m
q1=q2=3.03×10^-6C
W=UF-Ui
W= kq1q2/a - kq1q2/r
But r= sqrt(a^2+a^2)=sqrt2a
W=kq1q2/a - kq1q1/sqrt2a
W= kq1q2/a (1 -1/sqrt2)
W= (9×10^9)(3.03×10^-6)(3.03×10^-6)(1-1/sqrt2)
W= 0.05Joules
Answer:
![V = 228\ V](https://tex.z-dn.net/?f=V%20%3D%20228%5C%20V)
Explanation:
given,
charge of two spherical drop = 0.1 nC
potential at the surface = 300 V
two drops merge to form a single drop
potential at the surface of new drop = ?
![V = \dfrac{kq}{r}](https://tex.z-dn.net/?f=V%20%3D%20%5Cdfrac%7Bkq%7D%7Br%7D)
![r = \dfrac{9\times 10^9\times 0.1 \times 10^{-9}}{300}](https://tex.z-dn.net/?f=r%20%3D%20%5Cdfrac%7B9%5Ctimes%2010%5E9%5Ctimes%200.1%20%5Ctimes%2010%5E%7B-9%7D%7D%7B300%7D)
r = 0.003 m
volume = ![2 \times \dfac{4}{3}\pi r^3](https://tex.z-dn.net/?f=2%20%5Ctimes%20%5Cdfac%7B4%7D%7B3%7D%5Cpi%20r%5E3)
= ![2 \times \dfac{4}{3}\pi \times 0.003^3](https://tex.z-dn.net/?f=2%20%5Ctimes%20%5Cdfac%7B4%7D%7B3%7D%5Cpi%20%5Ctimes%200.003%5E3)
= 2.612 × 10⁻⁷ m³
![\dfac{4}{3}\pi R^3 = 2.612\times 10^{-7}](https://tex.z-dn.net/?f=%5Cdfac%7B4%7D%7B3%7D%5Cpi%20R%5E3%20%3D%202.612%5Ctimes%2010%5E%7B-7%7D%20)
R = 0.00396 m
![V = \dfrac{kq}{r}](https://tex.z-dn.net/?f=V%20%3D%20%5Cdfrac%7Bkq%7D%7Br%7D)
![V = \dfrac{9\times 10^9 \times 0.1 \times 10^{-9}}{0.00396}](https://tex.z-dn.net/?f=V%20%3D%20%5Cdfrac%7B9%5Ctimes%2010%5E9%20%5Ctimes%200.1%20%5Ctimes%2010%5E%7B-9%7D%7D%7B0.00396%7D)
![V = 227.27](https://tex.z-dn.net/?f=V%20%3D%20227.27)
![V = 228\ V](https://tex.z-dn.net/?f=V%20%3D%20228%5C%20V)
Answer:
The field lines go out of Earth near Antarctica, enter Earth in northern Canada, and are not aligned with the geographic poles.
Explanation: