A U-238 nucleus (mass = 238 units) decays, transforming into an alpha particle (mass = 4.00 units) and a residual thorium nucleus (mass = 234 units). If the uranium nucleus was at rest, and the alpha particle has a speed of 1.50 × 10^7 m/s, determine the recoil speed of the thorium nucleus
2.56 × 10^5 m/s
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Which telescope is the largest refracting telescope in the world?
a. Large Binocular Telescope b. Gemini-North optical telescope c. Very Large Array d. Keck telescope e. Yerkes Observatory refractor telescope
Two strings on a violin are stretched between two points 20.0 cm apart. The mass per length of the strings are the same. If the ratio of the frequencies of the fundamental modes is 1.5 to 1.0, then what is the ratio of the tensions in the strings?
A. 1.75 B. 1.88 C. 1.00 D. 1.25 E. 1.50
The oldest rocks are found
A) at convergent boundaries. B) at divergent boundaries. C) in the ocean basins. D) on continental land.
Scientific notation is used in science because
a. it makes it easy to write big or small numbers. b. all astronomical distances are expressed in metric units. c. it makes conversions between units easy. d. all of the above