Sand
dead creatures
polluted coral reefs will die
REMEMBER...CORAL ARE LIVING
The force applied is 47.3 N
Explanation:
First of all, we start by calculating the acceleration of Hailey, which is given by
![a=\frac{v-u}{t}](https://tex.z-dn.net/?f=a%3D%5Cfrac%7Bv-u%7D%7Bt%7D)
where:
v = 3.5 m/s is the final velocity
u = 2 m/s is the initial velocity
t = 2 s is the time elapsed
Substituting, we find the acceleration:
![a=\frac{3.5-2}{2}=0.75 m/s^2](https://tex.z-dn.net/?f=a%3D%5Cfrac%7B3.5-2%7D%7B2%7D%3D0.75%20m%2Fs%5E2)
Now we can find the force applied by using Newton's second law:
![F=ma](https://tex.z-dn.net/?f=F%3Dma)
where
F is the force applied
m = 63 kg is the mass of Hailey+the skate
is the acceleration
Substituting, we find the force:
![F=(63)(0.75)=47.3 N](https://tex.z-dn.net/?f=F%3D%2863%29%280.75%29%3D47.3%20N)
Learn more about Newton's second law:
brainly.com/question/3820012
#LearnwithBrainly
Answer:
10.65°
Explanation:
To calculate the initial Mach Number
![Sin \beta _{weak} = \frac{1}{Ma_1}](https://tex.z-dn.net/?f=Sin%20%5Cbeta%20_%7Bweak%7D%20%3D%20%5Cfrac%7B1%7D%7BMa_1%7D)
![Ma_1 = \frac{1}{sin \beta_weak}](https://tex.z-dn.net/?f=Ma_1%20%3D%20%5Cfrac%7B1%7D%7Bsin%20%5Cbeta_weak%7D)
![Ma_1 = \frac{1}{sin 30}](https://tex.z-dn.net/?f=Ma_1%20%3D%20%5Cfrac%7B1%7D%7Bsin%2030%7D)
![Ma_1 = 2](https://tex.z-dn.net/?f=Ma_1%20%3D%202)
Now, to calculate the angle turned by the wall; we have the following expression.
![tan \theta = \frac{2 cot \beta_i (Ma_1^2 sin^2 \beta_i -1 )}{Ma_1^2(k+cos2 \beta_i)+2}](https://tex.z-dn.net/?f=tan%20%5Ctheta%20%3D%20%5Cfrac%7B2%20cot%20%5Cbeta_i%20%28Ma_1%5E2%20sin%5E2%20%5Cbeta_i%20-1%20%29%7D%7BMa_1%5E2%28k%2Bcos2%20%5Cbeta_i%29%2B2%7D)
where:
= the angle between the initial flow direction = 40°
K is the ratio of specific heats o fair = 1.4
![tan \theta = \frac{2 (cot 40) (2^2 (sin 40)^2 -1 )}{2^2(1.4+cos2 (40))+2}](https://tex.z-dn.net/?f=tan%20%5Ctheta%20%3D%20%5Cfrac%7B2%20%28cot%2040%29%20%282%5E2%20%28sin%2040%29%5E2%20-1%20%29%7D%7B2%5E2%281.4%2Bcos2%20%2840%29%29%2B2%7D)
![tan \theta = \frac{1.56}{8.295}](https://tex.z-dn.net/?f=tan%20%5Ctheta%20%3D%20%5Cfrac%7B1.56%7D%7B8.295%7D)
![tan \theta = 0.188](https://tex.z-dn.net/?f=tan%20%5Ctheta%20%3D%200.188)
![\theta = tan ^{-1}( 0.188)](https://tex.z-dn.net/?f=%5Ctheta%20%3D%20tan%20%5E%7B-1%7D%28%200.188%29)
![\theta = 10.65^0](https://tex.z-dn.net/?f=%5Ctheta%20%3D%2010.65%5E0)
In my opinion, it would be coke because of all the pressure
Protons, electrons, and neutrons have electrical charges. Protons are positive. Electrons are negative and neutrons are neutral (no charge).<span />