How long is a wire made from 200 cm3 of copper if its resistance is 8.5 ohms? The resistivity of copper is 1.7 × 10^–5 W•m
a. 10 m
c. 7.1 m
b. 2.2 × 10^2 m
d. 3.0 × 10^3 m
A
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Because of ________, the Moon is moving away from the Earth at about 4 centimeters per century
Fill in the blank(s) with correct word
Which of the following statements about electrons is not true?
A) Electrons orbit the nucleus rather like planets orbiting the Sun. B) Within an atom, an electron can have only particular energies. C) An electron has a negative electrical charge. D) Electrons have little mass compared to protons or neutrons. E) Electrons can jump between energy levels in an atom only if they receive or give up an amount of energy equal to the difference in energy between the energy levels.
One star is three times further away than another. The parallax angle of the more distant star is:
A. nine times larger than that of the nearer star B. three times larger than that of the nearer star C. the same as that of the nearer star D. three times smaller than that of the nearer star E. nine times smaller than that of the nearer star
Prior to the time when Luis and Walter Alvarez proposed that an impact led to the extinction of the dinosaurs, it was generally assumed that the dinosaurs had died out over a period of at least thousands to millions of years. Consider each piece of evidence listed below and sort it into the correct bin based on whether it supports a sudden cause for the demise of the dinosaurs or whether it could also be consistent with a gradual cause leading to their demise over many thousands or more years.
Note: The “K-T sediment layer” refers to the geological layer dating to about 65 million years ago that separates sediments that contain dinosaur fossils from those that do not.
