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What are mechanical waves? What do you think waves carry? Can you see waves? Examples?. Mechanical Waves. Mechanical waves are disturbances in matter that carry energy from one place to another. Usually require matter through which to travel
What do you think waves carry?
Can you see waves? Examples?
An imaginary line which runs through both
poles of a planet.
Question: Why do lunar eclipses occur only during full moons?
Answer: That is the only time that the earth comes between the moon and sun.
Question: Why don’t we have a lunar eclipse every full moon?
Answer: The tilt of the moon’s orbit is 5° different than the earth
Answer: The light from the sun gets bent as it passes through our atmosphere causing it to appear red.
Question: Why does the full moon appear to be red during certain times of the year?
The region where the magnetic forces
act is called the “magnetic field”
All magnetic phenomena result from forces between electric charges in motion.
Electrons are loosely held by atoms of some materials
These electrons can be moved
Loosing these electrons makes the atoms electrically charged
Friction, conduction, and induction are three ways atoms can be charged
1. There are North Poles and South Poles.
2. Like poles repel, unlike poles attract.
3. Magnetic forces attract only magnetic materials.
4. Magnetic forces act at a distance.
5. While magnetized, temporary magnets act like permanent magnets.
9. A charged particle experiences no magnetic force when moving parallel to a magnetic field, but when it is moving perpendicular to the field it experiences a force perpendicular to both the field and the direction of motion.
10. A current-carrying wire in a perpendicular magnetic field experiences a force in a direction perpendicular to both the wire and the field.
There is so much air above you that at sea level you have 14.7 lbs/in2 pushing on you.
Gravity causes most of the air to be pulled down to the surface.Air Pressure
The air at sea level and at 6km has the same 21% oxygen, but at 6km there are fewer molecules, so you take in less oxygen with each breath.
Shows density of airAltitude and Density
Air cools as it rises (air molecules lose energy)
The air cools by about 6.5°C for every 1-km above the ground.
In 10 KM air will cool
6.5*10=65Temperature and the Troposphere
Without greenhouse gases, energy pretty much passes straight through!Temperature and the Mesosphere
But the air is so thin here that it takes special instruments to measure the temperature accurately.
So even though it is very hot (over 1000°C), it would feel cold because there are so few particles to transfer heat to you.Temperature and the Thermosphere