Answer:
Two non metals
Explanation:
Covalent bonding is a chemical bonding that involves sharing of electrons
a metal and a metalloid can be described as a metallic bond.
a metal and a nonmetal is an example that describes an ionic bonding
While two non metals is a typical example of a covalent bonding.
Therefore, two non metals describes the substances that form covalent bonds
By definition;
M = fo/fe
Where,
M = Angular magnification
fo = Focal length of objective lens
fe = Focal length of eyepiece lens
From the information given;
M = 180/30 = 6
Answer:
The ball is in the air for 3.628 sec
Explanation:
We can find speed in the "y" direction when the ball lands with this equation:
Where: because the ball is thrown horizontally
because gravity is a vector that points down in the "y" direction
because the ball lands on the ground
Then:
because the ball is falling and that means speed in the "y" direction is a vector that points down
Now we can calculate the time with next equation:
Then:
Finally t = 3.628 sec
The satellite travels slowest when it is at the maximum distance from the Earth.
We can verify this in two ways:
1) By using Kepler's second law: "A line segment joining a a satellite with the Earth covers equal areas during equal intervals of time". This means that the larger is the distance of the satellite from Earth, the slower it goes.
2) by looking at the forces acting on the satellite. There is only one force acting on it: the gravitational attraction exerted by Earth, and this force is the centripetal force that keeps the satellite in circular (elliptical, actually) motion. So we can write:
where on the left we wrote the formula of the gravitational force, while on the right the centripetal force. G is the gravitational constant, M the Earth's mass, m the satellite's mass, v its velocity and r the distance of the satellite from the center of Earth.
Simplifying, we get
which is the speed of the satellite when it is at a distance r from Earth: the larger r, the smaller the speed v.
In my opinion, the greenhouse effect is desirable for human life, and the life of other organisms. Most of the Earth's atmosphere is made up of nitrogen and oxygen, which do not have much effect in regulating the climate. The Earth absorbs this energy and radiates heat energy at a longer wavelength (infrared radiation) back into the atmosphere. This boosts the beneficial proteins made by people in their systems.