Investigating energy waves other than light is usually accomplished by using a a. refracting telescope

b. microscope

c. reflecting telescope

d. radio telescope

d. radio telescope

Explanation:

A radio telescope allows the analysis of radio light waves by first, collecting them, then bringing them to a focus and amplifying them in preparation for analysis. They are the largest telescope in the world and are said to have the ability to observe light with long wavelengths. This makes them different from optical telescopes that are meant to observe visible lights. This allows the astronomers to study the composition of the heavenly bodies in the universe.

c because the action was the roller coaster reaches bottom of hill (action) reaction would be blood tends to drain away from head

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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.