Convert the following: 1. 60.0 mi/h. to ft/s 2. 15 ib/in2 to kg/m? 3. 6.20 cm/hr2 to nm/s

What is the empirical formula of c6h18o3? ch3o c2h5o c2h6o c2h5o5

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Nebulae are enormous clouds in outer space. they are made mostly of hydrogen gas, helium gas, and dust. some nebulae glow brightly, while others do not. the stars that people see are huge, bright balls of glowing gas. they are made mostly of hydrogen and helium. which statement correctly describes other ways in which nebulae and stars are different? a. stars can form inside a nebula but a nebula can never be produced by any star. b. a star always has a higher density than a nebula. c. stars can never form inside a nebula but a nebula can be produced by any star. d. a nebula always has a higher density than a star.