h=average v * time
average v = (0+ 20)/2 =10
so: h = 20 = 10 * t --> t = 2 sec
final v = v0 + at
v0=0 --> 20 = 0 + a*2 -> a = 10 m/s2
The answer is neither the momentum nor kinetic energy is conserved
Answer:
Their experimental design lacks control group
Explanation:
Based on what I read, the scientists don't have a control group as one of the main groups thus they cannot, in scientific sense, say that the medicine is better or worse. You always need a control group receiving no intervention because then we can compare groups and assess the effectiveness of that intervention (in our case if we had control group vs people who received the medicine, we could see if the people who received the medicine had improved condition etc when compared to participants who did not receive anything)
Answer:
Total pressure= 120945[Pa]
Force exerted = 29026800 [N] or 29.02*10^6 [N]
Explanation:
We know that the total pressure is the result of the sum of the atmospheric pressure plus the manometric pressure. The equation is:

In this problem we know the atmospheric pressure 101.325x10^3 [Pa], therefore we need to find the manometric pressure.
The manometric pressure in the bottom of the swimming pool depends only on the water column of water generated (depth of the swimming pool)

where:
density = density of the water 1000 [kg/m^3]
g= gravity [m/s^2]
h= column of water (meters)
replacing the values:
![Pman= 1000 *9.81* 2 = 19620 [Pa]\\\\](https://tex.z-dn.net/?f=Pman%3D%201000%20%2A9.81%2A%202%20%3D%2019620%20%5BPa%5D%5C%5C%5C%5C)
The total pressure will be:
![Ptotal= 101325+19620 = 120945 [Pa]\\\\](https://tex.z-dn.net/?f=Ptotal%3D%20101325%2B19620%20%3D%20120945%20%5BPa%5D%5C%5C%5C%5C)
The force exerte on the bottom is defined by the following expression:

Answer: damping coefficient = 1.5×10^5Ns/m
Explanation:
Please find the attached file for the solution