An emission spectrum is: A. various wavelengths emitted by an excited substance
B. the wavelengths that are removed from a continuous spectrum when it passes through a substance
C. a spectrum that contains only a few discrete wavelengths
D. a spectrum containing all wavelengths
E. the range of wavelengths emitted or absorbed by an object

b is the correct

they are made of gases.

they have a spherical shape.

they make energy through fusion.

question: ray weighs 100 kilograms, his wrestling partner, bobby, weighs 50 kilograms. if ray moves at 4 m s , how fast will bobby have to run at him to apply an equal amount of kinetic energy?

answer: 8 m/s he needs to run twice as fast to keep up so he has some work to do

explanation:   if the mass has units of kilograms and the velocity of meters per second, the kinetic energy has units of kilograms-meters squared per second squared.

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(jacemorris04)