Alexa is teaching students to measure and compare the speed of a pencil as it is dropped from different heights

why is this experiment considered science?

are able to decide what height allowed the pencil to travel the fastest
it involves experimentation and observation of the pencil dropping from different heights
it involves alexa is judgment on what was the fastest speed of the falling pencil

Temperature is _related to the average kinetic energy of a gas. inversely directly not disproportionally

Look at the spectrums of a star moving towards earth and a motionless star. which of these is a correct inference that can be draw from the observation of the two spectrums? (2 points) the spectrum of a motionless star is difficult to be viewed separately using oridinary telescopes. the spectrum of a motionless star is identical to the spectrum of a star which moves towards earth. the spectrum of a star shifts towards the red region when the star moves towards earth. the spectrum of a star shifts towards the blue region when the star moves towards earth.

Which of the following nuclei would be the least stable a 2 protons, 2 neutrons b 1 proton 1 neutron c 1 proton 3 neutrons d 1 proton 2 neutrons