Tensile Stress and Strain: Which of the following are SI units of Young's modulus? (There could be more than one correct choice.)

A. N/m ? s2
B. kg/m2
C. kg ? m/s2
D. kg/m ? s2
E. kg ? m2/s2


Answer: D

Physics & Space Science

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A piece of aluminum with a mass of 1.0 kg and density of 2700 kg/m3 is suspended from a light cord and then completely immersed in a container of water having density 1000 kg/m3

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Assuming the Hubble constant is (21 km/s)/(106 ly), what is the recession speed of a galaxy 300 million parsecs away? (1 parsec = 3.26 ly)

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