The multiple reflection of a single sound
wave is a/an

kepler used the data from tycho blahe (his mentor) to construct the laws of planetary motion.

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.

as we know our atmosphere or air have different levels. every level has other gasses, and every gas has another permeability. when the light comes from lower permeability to higher permeability, it changes its direction. so that means that when the light comes from the moon to the earth, it changes it's direction many more times. it basically means that the shape of the light part of the moon is changed on the earth.

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float.

archimedes' principle

denser than water sinks in water.

denser than mercury would sink in it