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15
×
Which diagram of energy changes represent this event ?
potential gravitational energy changes to kinetic energy
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15
×
Explain why scientists cannot watch the complete process of a star and planets forming.
The planet forming process takes a really long time.
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15
×
How many times does hight tide happen in one day (24 hours) ?
Twice
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15
×
Most of wasted energy in the form of ____ energy
thermal
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baam
Lose 10 points!
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star
Double points!
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fairy
Take points!
5
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20
25
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thief
Give points!
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25
15
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Seawater on the side of the Earth closest to the Moon experiences _____ (high tide or low tide)
high tide
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lifesaver
Give 5 points!
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star
Double points!
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rocket
Go to first place!
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thief
Give points!
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25
15
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How long the time difference between one high tide and the next high tide? approximately ...
12 hours
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15
×
How the mass of an object on Mars would compare with the mass of the same object on Earth ?
same
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15
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There is no air in space. The space where there are no particles is called...
vacuum
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15
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Name the force that can pull particles of dust and gas together in space.
Gravity
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20
×
Calculate the mass of an apple that has weight of 20 N.
2 Kg
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15
×
What kind of energy that store in a streched spring ?
Elastic potential energy
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10
×
Fuel such wood, coal and oil stored ...... energy.
chemical energy
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boom
Lose 50 points!
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fairy
Take points!
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25
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gift
Win 25 points!
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banana
Go to last place!
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15
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What is the unit of weight and force?
Newton
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