Answer:
210
Explanation:
A person's estimated maximum heart rate is 220 minus their age. Since she is 18, her maximum is <em>220 </em>- <em>18 </em>= <em>202</em>. As hers was 8 beats over her maximum, simply add 8 to 202 to find 210 as her heart rate.
Answer:
A, Magnetism
Explanation:
An ordinary electric generator produces electric power by spinning a strong magnet inside a set of wire coils. As the magnet spins, its magnetic field sweeps across the coils and gives rise to electric fields in those coils.
Hope this helps!!
To solve this problem it is necessary to use the concepts related to Snell's law.
Snell's law establishes that reflection is subject to
![n_1sin\theta_1 = n_2sin\theta_2](https://tex.z-dn.net/?f=n_1sin%5Ctheta_1%20%3D%20n_2sin%5Ctheta_2)
Where,
Angle between the normal surface at the point of contact
n = Indices of refraction for corresponding media
The total internal reflection would then be given by
![n_1 sin\theta_1 = n_2sin\theta_2](https://tex.z-dn.net/?f=n_1%20sin%5Ctheta_1%20%3D%20n_2sin%5Ctheta_2)
![(1.54) sin\theta_1 = (1.33)sin(90)](https://tex.z-dn.net/?f=%281.54%29%20sin%5Ctheta_1%20%3D%20%281.33%29sin%2890%29)
![sin\theta_1 = \frac{1.33}{1.54}](https://tex.z-dn.net/?f=sin%5Ctheta_1%20%3D%20%5Cfrac%7B1.33%7D%7B1.54%7D)
![\theta = sin^{-1}(\frac{1.33}{1.54})](https://tex.z-dn.net/?f=%5Ctheta%20%3D%20sin%5E%7B-1%7D%28%5Cfrac%7B1.33%7D%7B1.54%7D%29)
![\theta = 59.72\°](https://tex.z-dn.net/?f=%5Ctheta%20%3D%2059.72%5C%C2%B0)
Therefore the
would be equal to
![\alpha = 90\°-\theta](https://tex.z-dn.net/?f=%5Calpha%20%3D%2090%5C%C2%B0-%5Ctheta)
![\alpha = 90-59.72](https://tex.z-dn.net/?f=%5Calpha%20%3D%2090-59.72)
![\alpha = 30.27\°](https://tex.z-dn.net/?f=%5Calpha%20%3D%2030.27%5C%C2%B0)
Therefore the largest value of the angle α is 30.27°
I believe the best answer is B