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Get to know the forces of nature.
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Which of the following is designed to convert energy into mechanical work?
An electric fan converts energy into mechanical work.
Which of the following best explains why the pressure inside a high-flying airplane must be controlled?
At high altitudes there is lower atmospheric pressure than on the surface of the Earth.
To keep a box sliding across a floor at a constant speed, a person must continually exert a force on the box. This force is used primarily to overcome which of the following?
The frictional force exerted by the floor on the box.
As observed with special instruments from Earth, the Sun appears to be slightly larger in January than in July. Why?
The Earth moves in an orbit that is not circular but is closer to the Sun in January than in July.
The equation “X -> Y + Z + energy” represents a nuclear decay, in which nucleus X decays into particle Y and nucleus Z. Why is energy released in the decay?
The mass of X is greater than the sum of the masses of Y and Z.
Ten liters of CO2 gas contains the same number of molecules as how many liters of O2 gas at the same temperature and pressure?
What property of water is most important for living organisms?
It is liquid at most temperatures on Earth.
The Earth’s Moon is:
Always much closer to the Earth than it is to the Sun.
Beryl finds a rock and wants to know what kind it is. Which piece of information about the rock will best help her to identify it?
The minerals the rock contains.
Air in the atmosphere continuously moves by convection. At the equator, air rises; at the poles, it sinks. This occurs because:
Warm air is less dense than cold air.
I got a 90% and i’m in 6th grade!!!!!!
What school district??
hi my friend how are you
I’m in 6th grade and got an 80% 🙂
I was guessing for two of them!!!
I got a %70 but whatever! 🙂
I did not like this test it was quiet hard
I got a 100% without even trying I just thought for a sec then answered.
cool test i made a 90 percent.