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What is the force that acts to slow the spacecraft in the air around Earth, but does not act on the spacecraft in space?
air resistance
Which diagram of energy changes represent this event ?
potential gravitational energy changes to kinetic energy
The direction of the sun's gravitational force acting on the planets is always...
towards the sun
What makes Neptune, which is 30 times farther from the sun than Earth and yet still able to stay in its orbit?
Because it also has greater mass
What are the effects of tides
the harbours can only be used at certain times of the day, affect food chains, can be dangerous for small boats
Explain why scientists cannot watch the complete process of a star and planets forming.
The planet forming process takes a really long time.
Most of wasted energy in the form of ____ energy
thermal
The difference in depth of the water between high and low tides is _____
tidal range
Seawater on the side of the Earth closest to the Moon experiences _____ (high tide or low tide)
high tide
The useful energy in the cooking process like in the picture above is to ______
heat the food
How the mass of an object on Mars would compare with the mass of the same object on Earth ?
same
What kind of energy that store in a streched spring ?
Elastic potential energy
Fuel such wood, coal and oil stored ...... energy.
chemical energy
Calculate the mass of an apple that has weight of 20 N.
2 Kg
How long the time difference between one high tide and the next high tide? approximately ...
12 hours
There is no air in space. The space where there are no particles is called...
vacuum
How many times does hight tide happen in one day (24 hours) ?
Twice
Aldy has mass 45 kg on Earth (g=10 N/Kg). What is his weight?
450 N
What is the unit of mass?
Kilogram
Name the force that can pull particles of dust and gas together in space.
Gravity
What is the unit of weight and force?
Newton


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