The spectrum of the sun has hundreds of strong lines of nonionized iron but only a few, very weak lines of helium. a star of spectral type b has very strong lines of helium but very weak iron lines. do these differences mean that the sun contains more iron and less helium than the b star? explain.
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Physics, 23.06.2019 00:20
An object with a mass of 1.5 kg changes its velocity from + 15 m/s to +22 m/s during a time interval of 3.5 seconds. what impulse was delivered to the objects?
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Physics, 23.06.2019 07:40
Consider lifting a box of mass m to a height h using two different methods: lifting the box directly or lifting the box using a pulley (as in the previous part). what is wd/wp, the ratio of the work done lifting the box directly to the work done lifting the box with a pulley?
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The spectrum of the sun has hundreds of strong lines of nonionized iron but only a few, very weak li...
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