Duration : 0:0:0

Duration : 0:0:0

longessays.com & essay generator.com

that can pass copyscape test

How about you actually do your work and try to make something of yourself? Or you can just work at McDonalds the rest of your life. Here’s a good website for you: http://www.mcdonalds.com

longessays.com & essay generator.com

that can pass copyscape test

How about you actually do your work and try to make something of yourself? Or you can just work at McDonalds the rest of your life. Here’s a good website for you: http://www.mcdonalds.com

Duration : 0:0:0

Duration : 0:0:0

Duration : 0:0:0

1. in what was is an electric motor the opposite of a generator?
2. who published an article about the properties of a lodestone in 1269
3. what is the scientific name for the southern lights?
4. a _____ is a region of space with a physical property that has a definite value at every point in the region
5. compasses were invented in what country?
6. the earth’s magnetic south pole is how far away from the geographic north pole?
7. groups of atoms with aligned magnetic poles are called ____?
8. who hypothesized that an electric current produces a magnetic field?
9. how does a stereo speaker use an electromagnet to produce sound?
10. the first commercially useful electric motor was a ___ built in the early 1870’s
10. list at least 3 simple ferromagnetic materials and their elemental symbol.
12. the first AC motor was built by ____ in 1888
13. how many times have the earth’s magnetic poles switched places?
14. what are the 2 types of magnetic resonance imagery? (names not abbreviations)
15 a compass rotates until it lines up with ___?
16. for each revolution of the coil in a simple generator, how many times does the current change direction?
17. how does a commutator in an electric motor work?
18. what causes the aurora in the northern and southern hemispheres?
19. what natural body was used to find the north-south direction before the compass was invented (give both names)

i’ll be doing these questions too, so im not just asking because i’m lazy, ill just need a back up to make sure i’m right.. if i miss one i fail.
so thank you
1.An electric motor converts electric current into mechanical force. An electric generator converts mechanical force into electric current.
2.1269 that the first Western account of a magnet and its properties "Epostolia de Magnete", was written by Petrus Perigrinus in 1269.
3.Southern Lights are known as Aurora Australis.
4.A field in mathematics is something which exists throughout a region and which has a definite value at every point within that region.
5.The true mariner’s compass used a pivoting needle in a dry box, and was invented in Europe no later than 1300.
6. 1500 km is the distance between the north and south pole
7.the small group of atoms who have aligned magnetic fields are called magnetic domains
8. Hans Christian Oersted is who hypothesized that an electric current produces a magnetic field
9.The electromagnet is a wire coil that is usually wrapped around a piece of iron. When running electrical current through the wire it creates a magnetic field. With an electromagnet you can change its magnetic pole. When the flow of the current is changed the north and south poles of the wire switch. The stereo signal does this; it constantly switches the flow of electricity, electrical energy is converted to mechanical energy, which vibrates the cones to make sound.
10.Jedlik’s electric motor was invented by accident in 1873, when Zénobe Gramme connected the dynamo he had invented to a second similar unit, driving it as a motor. The Gramme machine was the first electric motor that was successful in the industry.
11.cobalt-Co, Fe iron, Ni nickel
12.In 1888 Nikola Tesla invented the first practicable AC motor and with it the polyphase power transmission system.
13.Earth’s magnetic poles have changed places over 150 in the past seventy million years.
14.
15.the needle lines up with north and south pole
16. It changes twice with each revolution
17.The commutator reverses the direction of the current in coil.
18.This light display occurs when blast of charge particles from the sun a captured by the earth’s magnetic field.
19.
20.Aurora Borealis is the scientific name for the northern light’s
hey i cant find 19 i suggest getting it from someone in your class

Duration : 0:0:0

Duration : 0:0:0