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A car experiences a 300 N force to the
right from the engine and separate 150 N
force due to air resistance to the left.
A rope experiences three 400 N forces to
the left and three different 410 N forces
to the right
A skateboard is pushed up a hill with a 90 A box experiences a 20 N force to the left
N force to the left and experiences a and two different 8 N forces to the right
gravitational force of 100 N to the right
A box experiences a 20 N force to the left
and a 19 N frictional force to the right
A bottle rocket experiences a 500 N force
to the right and 300 N of air resistance to
the left
Will accelerate to the left
Will accelerate to the right
Will not accelerate
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The earth's moon is unusually large. two popular theories of the moon's origin include the "sister world" hypothesis, which states that the moon formed from the same materials as the earth, near enough to the earth that they fell into orbit around each other. a second theory is the "capture" hypothesis, in which the moon formed elsewhere in the solar system, and the earth's gravity pulled it into its orbit. studies of what the moon is made of indicate that some of its materials had to come from the earth or from the same area of the solar system where the earth had formed. at the same time, the moon does not contain much of the material that makes up the earth's core, so the moon could not have formed from the same materials as the earth. how do the two facts above affect the described theories of the moon's origin? a. they show that scientists will never agree on where the moon came from. b. they show that more experiments on moon formation need to be done. c. they show that no theory accounts for the existence of the moon. d. they show that neither theory is complete and entirely correct.

In 2002, the rare earth elements mine in mountain pass, california was closed because

What determines the average kinetic energy of the particles in a gas? a. the number of collisions b. the number of particles c. the size of the particles d. the temperature