Match the following vocabulary with the descriptions. 1. science a proposed explanation for a narrow set of phenomena 2. scientific hypothesis a scientific explanation formulated based on known facts and repeated testing 3. scientific law a description of an observed phenomenon that holds true every time it’s tested under a given set of conditions 4. scientific theory a collective human effort to comprehend, or better understand, the history of the natural world and how it works, through physical evidence collected via observations

the chart show the masses and velocities of two colliding objects that stick together after a collision.

according to the law of conservation of momentum, the momentum of the object after the collision is  

answer

1,500

kg • m/s.

t = 1/400 h   ⇔ 0.0025 h ⇔ 9s ⇔ 0.15 m

any of the answers are correct.

the aurora is formed when charged particles emitted from the sun during a solar flare penetrate the earth's magnetic shield and collide with atoms and molecules in our atmosphere. these collisions result in countless little bursts of light, called photons, which make up the aurora.

auroras are generated by charged solar particles hitting molecules in earth's atmosphere. this usually happens in high latitudes, because our planet’s magnetic field tends to funnel these particles toward the poles. that’s why it can be experienced in northern ohio.

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