We use the following expression
T = 2*pi *sqrt(l/g)
Where T is the period of the pendulum
l is the length of the pendulum
and g the acceleration of gravity
We solve for l
l = [T/2*pi]² *g = [30s/2*pi]²* 9.8 [m/s²] = 223.413 m
The tower would need to be at least 223.413 m high
They discovered a vaccine to reduce illnesses, specifically Polio and Influenza. The work of Salk and Sabin has almost eradicated what was once a deadly disesase ( polio) . For example, there were 350,000 deaths related to poliovirus across the world in 1988 and they reduced to 22 in 2017. Also, their work has saved millions of lives from polio induced paralysis
Answer:
![t_1 = 0.28 s](https://tex.z-dn.net/?f=t_1%20%3D%200.28%20s)
![t_2 = 7.72 s](https://tex.z-dn.net/?f=t_2%20%3D%207.72%20s)
Explanation:
Given that height of the projectile as a function of time is
![h = -16 t^2 + 128 t + 112](https://tex.z-dn.net/?f=h%20%3D%20-16%20t%5E2%20%2B%20128%20t%20%2B%20112)
here we know that
h = 147 ft
so from above equation
![147 = -16 t^2 + 128 t + 112](https://tex.z-dn.net/?f=147%20%3D%20-16%20t%5E2%20%2B%20128%20t%20%2B%20112)
![16 t^2 - 128 t + 35 = 0](https://tex.z-dn.net/?f=16%20t%5E2%20-%20128%20t%20%2B%2035%20%3D%200)
now by solving above quadratic equation we know that
![t_1 = 0.28 s](https://tex.z-dn.net/?f=t_1%20%3D%200.28%20s)
![t_2 = 7.72 s](https://tex.z-dn.net/?f=t_2%20%3D%207.72%20s)
Answer: See the explanation below.
Explanation: For this assignment, I chose to display how eclipses are created.
My model was made utilizing a 3D displaying device program for all intents and purposes. The items utilized are three models I made for this presentation, Earth, the moon, and the sun. These three models will be utilized for the showcase.
The light that shines from the sun would create a shadow on the moon. The moon would then catch the light that should've arrived on Earth, making the shadow we call an eclipse. Earth gets a shadow of the moon and the remainder of Earth is lit up from the rest of the light, making an eclipse.
The individual I demonstrated my project to was [<em>Someone you know</em>], [<em>Pronoun</em>] said it precisely took after the occasion of an eclipse. The light from the sun being shined on to the moon rather than the Earth, creating the shadow we call an eclipse.