A neon light consists of a glass tube with metal wires at each end. When connected to a high-voltage source, the gas glows.
2 answers:
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The reason scientists use light years instead of kilometres is becasue a light year is the distance traveled by light in one year, and if we actually did the math (ill just give it to you)
to put that into perspective a kilometer is 1000 meters or 
. if they mesured everything in kilometers they would have to use even bigger numbers than they already do.
Answer:
m = 2301.8 [kg]
Explanation:
This problem can be solved in an easy way using the definition of kinetic energy, in this way you can clear the mass, depending on the known variables.