What is the approximate age of a star cluster where the brightest main sequence stars are G stars?
A) 10 billion years B) 100 billion years C) 10 million years
A
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When two elements form a eutectic phase diagram, in the eutectic reaction the atoms of the solid elements _____________.
Fill in the blank(s) with the appropriate word(s).
A 90.0 kg person is sitting in a boat at rest with a mass of 100 kg. In the boat is a stone with a mass of 5.00 kg. The person throws the stone at 4.00 m/s horizontally in the NORTH direction. The kinetic energy of the boat and person after the throwing of the stone is
A. 5.20 J. B. 40.0 J. C. 1.05 J. D. 2.75 J.
An object that completes 10 vibrations in 20 seconds has a frequency of
A) 0.5 hertz. B) 2 hertz. C) 200 hertz.
A beam of high-energy ?-particles is incident upon a person and deposits 0.35 J of energy in 0.80 kg of tissue. What dose in rads and what equivalent dose in rems does the individual receive? [RBE ? = 20]