i’m 1927 on mount wilson outside pasadena, california edwin hubble observed hydrogen spectra from distant galaxies that were red shifted. what was the change in the waves that he observed? what caused this change? what periodic phenomenon was this?

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The slope of a velocity time graph over any interval of time gives the during that interval

1. jay fills a wagon with sand (about 20 kg) and pulls it with a rope 30 m along the beach. he holds the rope 25° above the horizontal. the rope exerts a 20-n tension force on the wagon. how much work does the rope do on the wagon?