Most of the mass of our galaxy lies between Earth and the Galactic center
Indicate whether the statement is true or false
FALSE
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Radioactive Decay: The atom 40K decays radioactively to the gas 40Ar. An ancient rock is found to contain enough 40Ar gas to indicate that 77.0% of the 40K in the rock has decayed to 40Ar since the rock solidified. (Any previous argon would have boiled out of liquid rock.) How long ago did the rock solidify? The half-life of 40K is 1.25 billion years.
A. 2.65 billion years B. 0.471 billion years C. 1.80 billion years D. 0.324 billion years
Which has the events in the right order, from early to late?
A.) Star formation, quark soup, protons form, atoms form, nucleosynthesis. B.) Quark soup, protons form, nucleosynthesis, atoms form, star formation. C.) Nucleosynthesis, star formation, protons form, atoms form, quark soup. D.) Quark soup, atoms form, star formation, protons form, nucleosynthesis. E.) Atoms form, star formation, protons form, quark soup, nucleosynthesis.
Momentum: Calculate the speed at which a 0.723-kg object has the same momentum as a 1.30-kg object that is moving 0.515c.
A. 0.734c B. 0.712c C. 0.981c D. 0.592c
Spherical Mirrors: An object is 10 cm in front of a concave spherical mirror with a focal length of magnitude 3.0 cm. Where is the image?
A. 13 cm from the mirror B. 7.0 cm from the mirror C. 4.3 cm from the mirror D. 3.3 cm from the mirror