An electric motor accomplishes what task?

5. An electric motor accomplishes what task?
[removed] converts chemical energy into mechanical energy
[removed] converts electrical energy into electromagnetic energy
[removed] converts electrical energy into mechanical energy
[removed] converts mechanical energy into chemical energy
[removed] converts mechanical energy into electrical energy
The next five questions refer to these electric meters:
15. How much electricity was used during the month of June?
[removed] 2813 kwh
[removed] 2582 kwh
[removed] 3011 kwh
[removed] 2903 kwh
[removed] 2744 kwh
17.
How much would this energy cost the consumer? (assume the average rate of $0.07 per kwh)
[removed] $203.00
[removed] $210.77
[removed] $196.91
[removed] $188.90
[removed] $176.43
18. What was the meter reading on June 1?
[removed] 59,301
[removed] 58,300
[removed] 58,410
[removed] 69,411
[removed] 58,310
19. What was the meter reading on July 1?
[removed] 61,134
[removed] 61,132
[removed] 61,234
[removed] 61,123
[removed] 61,223
20. A piece of iron can be made into a permanent magnet by stroking it with a strong magnet.
[removed] true
[removed] false
10. If the frequency of a wave is 5 Hz, how many waves will pass by a stationary object in 1 minute?
[removed] 1/5
[removed] 5
[removed] 300
[removed] 60
[removed] 1/300
11. A submarine captain wishes to know how far away an undersea cliff face is, so he sends out a SONAR signal. After 0.80 seconds, he receives the echo. How far away is the cliff face?
[removed] 1500 m
[removed] 1200 m
[removed] 600 m
[removed] 3000 m
[removed] 2400 m
Use this figure to answer the next 3 questions:
12. On the diagram, which letter represents the amplitude?
[removed] A
[removed] B
[removed] C
[removed] D
[removed] E
13. Which of the letters represents the wavelength?
[removed] A
[removed] B
[removed] C
[removed] D
[removed] E
14. Which position represents the trough?
[removed] A
[removed] B
[removed] C
[removed] D
[removed]
E
1. If a star is moving away from Earth at a high speed, which of the following would astronomers observe?
[removed] The star’s spectrum would not be shifted at all.
[removed] The star’s spectrum would be shifted towards red.
[removed] The star’s spectrum would be shifted towards blue.
[removed]
There is not enough information given to determine.
5. The visible spectrum is made of what types of light?
[removed] red, orange, yellow, green, blue, violet
[removed] infrared, red, orange, green, blue, ultraviolet
[removed] red, orange, yellow, green, blue, ultraviolet
[removed] radio, infrared, colored light, ultraviolet, x-rays, gamma rays
10. Which of the following has the most energy?
[removed] x-rays
[removed] ultraviolet
[removed] visible light
[removed] gamma rays
[removed] infrared
11. Which of the following best describes the dual nature of light?
[removed] Light can be thought of as visible colors or as invisible colors.
[removed] Light can be thought of as being white light or a combination of colored light.
[removed] Light can be thought of as a mixture of colored light or a mixture of pigments.
[removed] Light can be thought of as behaving like a particle or like a wave.
13. What advantage does knowing about the atomic spectrum give astronomers?
[removed] It helps them predict solar and lunar eclipses.
[removed] It helps them determine what elements make up stars.
[removed] It helps them determine the age of the universe.
[removed] It helps them know what the planets are made of.
15. Which of the following has the longest wavelength?
[removed] infrared
[removed] visible light
[removed] gamma rays
[removed] x-rays
[removed] ultraviolet
16. Which of the following scientists did not attempt to calculate the speed of light?
[removed] Michelson
[removed] Huygens
[removed] Galileo
[removed] Einstein
17. Which of the following characteristics of an object would allow no light to pass through?
[removed] horizontal polarization
[removed] opaqueness
[removed] transparency
[removed] translucency
[removed] transmutaticity
19. The “speed of light” (c) refers to the speed of all electromagnetic waves under what conditions?
[removed] through the interstellar ether
[removed] through a clear liquid, like water
[removed] through a perfect vacuum
[removed] through the earth’s atmosphere
[removed] The speed of light is the same under any conditions.