While on vacation, Mr Brown rides a hot air balloon. To make the balloon rise, the pilot turns on a flame to warm the air inside the balloon. Which of these best describe the change in energy that makes the balloon rise

How to convert a density of 0.791g/cm3 to lb/ft3

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.

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