it's either the first or second choice
Oxygen has Atomic number 8 so all isotopes have 8 protons and 8 electrons.
So the number of neutrons in Oxygen-18 = 18 - 8 = 10.
Option B is the correct one.
B. If you press that into a calculator it comes up with 153.6. You then shift the decimal point 2 times forward and you end up getting 1.5 x 10^2 V.
Answer:
very smooth and polished glass mirror
Explanation:
The best type of mirror for this would be a very smooth and polished glass mirror. A metal mirror will also work but it would need to be extremely polished. This would allow light to efficiently be reflected across the room, thus effectively adding an "extra" light source to the room. If the mirror is not smooth then the light may become distorted and not reflect properly as it is supposed to. This may defeat the entire purpose of the mirror for this scenario.
Answer:
Explanation:
Given
mass of wheel m=13 kg
radius of wheel=1.8 m
N=469 rev/min
![\omega =\frac{2\pi \times 469}{60}=49.11 rad/s](https://tex.z-dn.net/?f=%5Comega%20%3D%5Cfrac%7B2%5Cpi%20%5Ctimes%20469%7D%7B60%7D%3D49.11%20rad%2Fs)
t=16 s
Angular deceleration in 16 s
![\omega =\omega _0+\alpha \cdot t](https://tex.z-dn.net/?f=%5Comega%20%3D%5Comega%20_0%2B%5Calpha%20%5Ccdot%20t)
![\alpha =\frac{\omega }{t}=\frac{49.11}{16}=3.069 rad/s^2](https://tex.z-dn.net/?f=%5Calpha%20%3D%5Cfrac%7B%5Comega%20%7D%7Bt%7D%3D%5Cfrac%7B49.11%7D%7B16%7D%3D3.069%20rad%2Fs%5E2)
Moment of Inertia ![I=mr^2=13\times 1.8^2=42.12 kg-m^2](https://tex.z-dn.net/?f=I%3Dmr%5E2%3D13%5Ctimes%201.8%5E2%3D42.12%20kg-m%5E2)
Change in kinetic energy =Work done
Change in kinetic Energy![=\frac{I\omega ^2}{2}-\frac{I\omega _0^2}{2}](https://tex.z-dn.net/?f=%3D%5Cfrac%7BI%5Comega%20%5E2%7D%7B2%7D-%5Cfrac%7BI%5Comega%20_0%5E2%7D%7B2%7D)
![\Delta KE=\frac{42.12\times 49.11^2}{2}=50,792.34 J](https://tex.z-dn.net/?f=%5CDelta%20KE%3D%5Cfrac%7B42.12%5Ctimes%2049.11%5E2%7D%7B2%7D%3D50%2C792.34%20J)
(a)Work done =50.79 kJ
(b)Average Power
![P_{avg}=\frac{E}{t}=\frac{50.792}{16}=3.174 kW](https://tex.z-dn.net/?f=P_%7Bavg%7D%3D%5Cfrac%7BE%7D%7Bt%7D%3D%5Cfrac%7B50.792%7D%7B16%7D%3D3.174%20kW)