21. A car traveled 112.0m in 24.500s, what was the car's average speed? * 4 points
2.0m/s
4.57m/s
136.5m/s
2477m/s

At 300 mm hg, a gas has a volume of 380 l, what is the volume at standard pressure

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.

How many grams of mgbr2 are needed to produce 75g or metal?