A plane figure with at least three straight sides and angles, and typically five or more.Polygon-
Consecutive vertices-The endpoints of one side of a polygon.
diagonal of a polygon
A polygon with all the angles equal and all the sides equal.
regular polygon
Any closed figure bounded by three or more segments that only intersect at their endpoints. The segments are called the sides, and the endpoints are called the vertices of the polygon.
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Answer:
D. F = 24000[N]
Explanation:
To be able to calculate the force we must first find the pressure at the bottom of the tank. By means of the following equation:

where:
Ro = density of the liquid = 800 [kg/m³]
g = gravity acceleration = 9.81 [m/s²]
h = elevation = 1.2 [m]
![P=800*9.81*1.2\\P=9417.6[Pa]](https://tex.z-dn.net/?f=P%3D800%2A9.81%2A1.2%5C%5CP%3D9417.6%5BPa%5D)
Pressure is defined as the relationship between Force on the area.
![P=F/A\\F=9417.6*2.5\\F = 23544 [N] = 24000[N]](https://tex.z-dn.net/?f=P%3DF%2FA%5C%5CF%3D9417.6%2A2.5%5C%5CF%20%3D%2023544%20%5BN%5D%20%3D%2024000%5BN%5D)
Answer:
3
Explanation:
The half-life is the time it takes for the amount of radioactive isotope to halve. Therefore, we have:
- After 1 half-life, only 1/2 of the element will be left
- After 2 half-lives, only 1/4 of the element will be left
- After 3 half-lives, only 1/8 of the element will be left
So, it will take 3 half-lives for the element to become 1/8 of its original amount.
Mathematically, this can be also verified by using the equation

where
N(t) is the amount of the element left at time t
N0 is the initial amount of the element
is the half-life
Substituting
(3 half-lives), we find

These answers aren´t valid .
The correct answer will be:
Planetary system.
Light speed is the speed at which light can travel in a "vacuum" (space for example).
The speed of light is constant and is exactly: 299,792,458 meters per second
ONLY IN A VACUUM!!
The speed of light changes when it goes through different mediums (such as from space to Earth, light travels slower in Earth).
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