Answer:
I'd love to help, but there isn't anything to choose from.
Answer:
![16.25^{\circ}](https://tex.z-dn.net/?f=16.25%5E%7B%5Ccirc%7D)
Explanation:
R = Horizontal range of projectile = 75 m
v = Velocity of projectile = 37 m/s
g = Acceleration due to gravity = ![9.81\ \text{m/s}^2](https://tex.z-dn.net/?f=9.81%5C%20%5Ctext%7Bm%2Fs%7D%5E2)
Horizontal range is given by
![R=\dfrac{v^2\sin2\theta}{g}\\\Rightarrow \theta=\dfrac{\sin^{-1}\dfrac{Rg}{v^2}}{2}\\\Rightarrow \theta=\dfrac{\sin^{-1}\dfrac{75\times 9.81}{37^2}}{2}\\\Rightarrow \theta=16.25^{\circ}](https://tex.z-dn.net/?f=R%3D%5Cdfrac%7Bv%5E2%5Csin2%5Ctheta%7D%7Bg%7D%5C%5C%5CRightarrow%20%5Ctheta%3D%5Cdfrac%7B%5Csin%5E%7B-1%7D%5Cdfrac%7BRg%7D%7Bv%5E2%7D%7D%7B2%7D%5C%5C%5CRightarrow%20%5Ctheta%3D%5Cdfrac%7B%5Csin%5E%7B-1%7D%5Cdfrac%7B75%5Ctimes%209.81%7D%7B37%5E2%7D%7D%7B2%7D%5C%5C%5CRightarrow%20%5Ctheta%3D16.25%5E%7B%5Ccirc%7D)
The angle at which the arrow is to be released is
.
The most dangerous frequencies of electromagnetic energy are X-rays, gamma rays, ultraviolet light and microwaves. X-rays, gamma rays and UV light can damage living tissues, and microwaves can cook them. Hope this helps! =^-^=